[svn-r27972] merge from trunk.

86 files changed, 5435 insertions, 110 deletions

diff --git a/tools/h5diff/CMakeTests.cmake b/tools/h5diff/CMakeTests.cmake
index c650dbe..33d0971 100644
--- a/tools/h5diff/CMakeTests.cmake
+++ b/tools/h5diff/CMakeTests.cmake
@@ -4,7 +4,7 @@
 ###           T E S T I N G                                                ###
 ##############################################################################
 ##############################################################################
-  
+
   # --------------------------------------------------------------------
   # Copy all the HDF5 files from the test directory into the source directory
   # --------------------------------------------------------------------
@@ -50,6 +50,30 @@
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/compounds_array_vlen2.h5
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/non_comparables1.h5
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/non_comparables2.h5
+      # tools/testfiles/vds
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_a.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_b.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_c.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_d.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_e.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_f.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_a.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_b.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_c.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_d.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_e.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/3_1_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/3_2_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_0.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_1.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_2.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_a.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_b.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_c.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_vds.h5
   )
 
   set (LIST_OTHER_TEST_FILES
@@ -231,6 +255,9 @@
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_710.txt
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_80.txt
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_90.txt
+      ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_v1.txt
+      ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_v2.txt
+      ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_v3.txt
   )
 
   # Make testfiles dir under build dir
@@ -283,7 +310,7 @@
         ARGS       -E copy_if_different ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_104w.txt ${PROJECT_BINARY_DIR}/testfiles/h5diff_104.txt
     )
   endif (WIN32)
-  
+
 ##############################################################################
 ##############################################################################
 ###           T H E   T E S T S  M A C R O S                               ###
@@ -399,7 +426,7 @@
 ##############################################################################
 
   # --------------------------------------------------------------------
-  # test file names 
+  # test file names
   # --------------------------------------------------------------------
   set (FILE1 h5diff_basic1.h5)
   set (FILE2 h5diff_basic2.h5)
@@ -425,7 +452,7 @@
   set (DANGLE_LINK_FILE2 h5diff_danglelinks2.h5)
   set (GRP_RECURSE_FILE1 h5diff_grp_recurse1.h5)
   set (GRP_RECURSE_FILE2 h5diff_grp_recurse2.h5)
-  # group recursive - same structure via external links through files 
+  # group recursive - same structure via external links through files
   set (GRP_RECURSE1_EXT h5diff_grp_recurse_ext1.h5)
   set (GRP_RECURSE2_EXT1 h5diff_grp_recurse_ext2-1.h5)
   set (GRP_RECURSE2_EXT2 h5diff_grp_recurse_ext2-2.h5)
@@ -447,13 +474,20 @@
   # attrs with verbose option level
   set (ATTR_VERBOSE_LEVEL_FILE1 h5diff_attr_v_level1.h5)
   set (ATTR_VERBOSE_LEVEL_FILE2 h5diff_attr_v_level2.h5)
+# VDS tests
+  set (FILEV1 1_vds.h5)
+  set (FILEV2 2_vds.h5)
+  set (FILEV3_1 3_1_vds.h5)
+  set (FILEV3_2 3_2_vds.h5)
+  set (FILEV4 4_vds.h5)
+  set (FILEV5 5_vds.h5)
 
   if (HDF5_ENABLE_USING_MEMCHECKER)
     # Remove any output file left over from previous test run
     add_test (
       NAME H5DIFF-clearall-objects
       COMMAND    ${CMAKE_COMMAND}
-          -E remove 
+          -E remove
           h5diff_10.out
           h5diff_10.out.err
           h5diff_100.out
@@ -800,6 +834,12 @@
           h5diff_80.out.err
           h5diff_90.out
           h5diff_90.out.err
+          h5diff_v1.out
+          h5diff_v1.out.err
+          h5diff_v2.out
+          h5diff_v2.out.err
+          h5diff_v3.out
+          h5diff_v3.out.err
     )
     set_tests_properties (H5DIFF-clearall-objects PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles")
     if (NOT "${last_test}" STREQUAL "")
@@ -816,13 +856,13 @@
 ADD_H5_TEST (h5diff_10 0 -h)
 
 # 1.1 normal mode
-ADD_H5_TEST (h5diff_11 1  ${FILE1} ${FILE2}) 
+ADD_H5_TEST (h5diff_11 1  ${FILE1} ${FILE2})
 
 # 1.2 normal mode with objects
 ADD_H5_TEST (h5diff_12 1  ${FILE1} ${FILE2}  g1/dset1 g1/dset2)
 
 # 1.3 report mode
-ADD_H5_TEST (h5diff_13 1 -r ${FILE1} ${FILE2}) 
+ADD_H5_TEST (h5diff_13 1 -r ${FILE1} ${FILE2})
 
 # 1.4 report  mode with objects
 ADD_H5_TEST (h5diff_14 1  -r ${FILE1} ${FILE2} g1/dset1 g1/dset2)
@@ -840,7 +880,7 @@ ADD_H5_TEST (h5diff_16_2 1 --verbose --relative=0.02 ${FILE1} ${FILE1} g1/dset7
 ADD_H5_TEST (h5diff_16_3 1 -v -p 0.02 ${FILE1} ${FILE1} g1/dset9 g1/dset10)
 
 # 1.7 verbose mode
-ADD_H5_TEST (h5diff_17 1 -v ${FILE1} ${FILE2})   
+ADD_H5_TEST (h5diff_17 1 -v ${FILE1} ${FILE2})
 
 # 1.7 test 32-bit INFINITY
 ADD_H5_TEST (h5diff_171 0 -v ${FILE1} ${FILE1} /g1/fp19 /g1/fp19_COPY)
@@ -848,8 +888,8 @@ ADD_H5_TEST (h5diff_171 0 -v ${FILE1} ${FILE1} /g1/fp19 /g1/fp19_COPY)
 # 1.7 test 64-bit INFINITY
 ADD_H5_TEST (h5diff_172 0 -v ${FILE1} ${FILE1} /g1/fp20 /g1/fp20_COPY)
 
-# 1.8 quiet mode 
-ADD_H5_TEST (h5diff_18 1 -q ${FILE1} ${FILE2}) 
+# 1.8 quiet mode
+ADD_H5_TEST (h5diff_18 1 -q ${FILE1} ${FILE2})
 
 # 1.8 -v and -q
 ADD_H5_TEST (h5diff_18_1 2 -v -q ${FILE1} ${FILE2})
@@ -878,7 +918,7 @@ ADD_H5_TEST (h5diff_23 0 -v ${FILE3} ${FILE3} g1 g1)
 ADD_H5_TEST (h5diff_24 0 -v ${FILE3} ${FILE3} t1 t1)
 
 # 2.5
-ADD_H5_TEST (h5diff_25 0 -v ${FILE3} ${FILE3} l1 l1) 
+ADD_H5_TEST (h5diff_25 0 -v ${FILE3} ${FILE3} l1 l1)
 
 # 2.6
 ADD_H5_TEST (h5diff_26 0 -v ${FILE3} ${FILE3} g1 g2)
@@ -920,7 +960,7 @@ ADD_H5_TEST (h5diff_57 0 -v ${FILE4} ${FILE4} dset7a dset7b)
 # 5.8 (region reference)
 ADD_H5_TEST (h5diff_58 1 -v ${FILE7} ${FILE8} refreg)
 
-# test for both dset and attr with same type but with different size 
+# test for both dset and attr with same type but with different size
 # ( HDDFV-7942 )
 ADD_H5_TEST (h5diff_59 0 -v ${FILE4} ${FILE4} dset11a dset11b)
 
@@ -929,13 +969,13 @@ ADD_H5_TEST (h5diff_59 0 -v ${FILE4} ${FILE4} dset11a dset11b)
 # ##############################################################################
 
 # 6.0: Check if the command line number of arguments is less than 3
-ADD_H5_TEST (h5diff_600 1 ${FILE1}) 
+ADD_H5_TEST (h5diff_600 1 ${FILE1})
 
-# 6.1: Check if non-exist object name is specified 
+# 6.1: Check if non-exist object name is specified
 ADD_H5_TEST (h5diff_601 2 ${FILE1} ${FILE1} nono_obj)
 
 # ##############################################################################
-# # -d 
+# # -d
 # ##############################################################################
 
 # 6.3: negative value
@@ -953,7 +993,7 @@ ADD_H5_TEST (h5diff_606 1 -d 0x1 ${FILE1} ${FILE2} g1/dset3 g1/dset4)
 # 6.7: string
 ADD_H5_TEST (h5diff_607 1 -d "1" ${FILE1} ${FILE2} g1/dset3 g1/dset4)
 
-# 6.8: use system epsilon 
+# 6.8: use system epsilon
 ADD_H5_TEST (h5diff_608 1 --use-system-epsilon ${FILE1} ${FILE2}  g1/dset3 g1/dset4)
 
 # 6.9: number larger than biggest difference
@@ -1032,12 +1072,12 @@ ADD_H5_TEST (h5diff_631 0 -v --use-system-epsilon ${FILE1} ${FILE1} g1/fp18 g1/f
 # ##############################################################################
 # 7.  attributes
 # ##############################################################################
-ADD_H5_TEST (h5diff_70 1 -v ${FILE5} ${FILE6}) 
+ADD_H5_TEST (h5diff_70 1 -v ${FILE5} ${FILE6})
 
 # ##################################################
 #  attrs with verbose option level
 # ##################################################
-ADD_H5_TEST (h5diff_700 1 -v1 ${FILE5} ${FILE6}) 
+ADD_H5_TEST (h5diff_700 1 -v1 ${FILE5} ${FILE6})
 ADD_H5_TEST (h5diff_701 1 -v2 ${FILE5} ${FILE6})
 ADD_H5_TEST (h5diff_702 1 --verbose=1 ${FILE5} ${FILE6})
 ADD_H5_TEST (h5diff_703 1 --verbose=2 ${FILE5} ${FILE6})
@@ -1054,7 +1094,7 @@ ADD_H5_TEST (h5diff_706 1 -v2 ${ATTR_VERBOSE_LEVEL_FILE1} ${ATTR_VERBOSE_LEVEL_F
 # different attr number , same attr name (intersected)
 ADD_H5_TEST (h5diff_707 1 -v2 ${ATTR_VERBOSE_LEVEL_FILE1} ${ATTR_VERBOSE_LEVEL_FILE2} /g2)
 
-# different attr number , all different attr name 
+# different attr number , all different attr name
 ADD_H5_TEST (h5diff_708 1 -v2 ${ATTR_VERBOSE_LEVEL_FILE1} ${ATTR_VERBOSE_LEVEL_FILE2} /g3)
 
 # when no attributes exist in both objects
@@ -1066,31 +1106,31 @@ ADD_H5_TEST (h5diff_710 1 -v2 ${ATTR_VERBOSE_LEVEL_FILE1} ${ATTR_VERBOSE_LEVEL_F
 # ##############################################################################
 # 8.  all dataset datatypes
 # ##############################################################################
-ADD_H5_TEST (h5diff_80 1 -v ${FILE7} ${FILE8}) 
+ADD_H5_TEST (h5diff_80 1 -v ${FILE7} ${FILE8})
 
 # 9. compare a file with itself
 ADD_H5_TEST (h5diff_90 0 -v ${FILE2} ${FILE2})
 
 # 10. read by hyperslab, print indexes
-ADD_H5_TEST (h5diff_100 1 -v ${FILE9} ${FILE10}) 
+ADD_H5_TEST (h5diff_100 1 -v ${FILE9} ${FILE10})
 
 # 11. floating point comparison
-ADD_H5_TEST (h5diff_101 1 -v ${FILE1} ${FILE1} g1/d1  g1/d2) 
+ADD_H5_TEST (h5diff_101 1 -v ${FILE1} ${FILE1} g1/d1  g1/d2)
 
-ADD_H5_TEST (h5diff_102 1 -v ${FILE1} ${FILE1} g1/fp1 g1/fp2) 
+ADD_H5_TEST (h5diff_102 1 -v ${FILE1} ${FILE1} g1/fp1 g1/fp2)
 
-# with --use-system-epsilon for double value. expect less differences  
+# with --use-system-epsilon for double value. expect less differences
 ADD_H5_TEST (h5diff_103 1 -v --use-system-epsilon ${FILE1} ${FILE1} g1/d1
-g1/d2) 
+g1/d2)
 
 # with --use-system-epsilon for float value. expect less differences
 ADD_H5_TEST (h5diff_104 1 -v --use-system-epsilon ${FILE1} ${FILE1} g1/fp1
 g1/fp2)
 
 # not comparable -c flag
-ADD_H5_TEST (h5diff_200 0 ${FILE2} ${FILE2} g2/dset1  g2/dset2) 
+ADD_H5_TEST (h5diff_200 0 ${FILE2} ${FILE2} g2/dset1  g2/dset2)
 
-ADD_H5_TEST (h5diff_201 0 -c ${FILE2} ${FILE2} g2/dset1  g2/dset2) 
+ADD_H5_TEST (h5diff_201 0 -c ${FILE2} ${FILE2} g2/dset1  g2/dset2)
 
 ADD_H5_TEST (h5diff_202 0 -c ${FILE2} ${FILE2} g2/dset2  g2/dset3)
 
@@ -1106,9 +1146,9 @@ ADD_H5_TEST (h5diff_206 0 -c ${FILE2} ${FILE2} g2/dset7  g2/dset8)
 ADD_H5_TEST (h5diff_207 0 -c ${FILE2} ${FILE2} g2/dset8  g2/dset9)
 
 # not comparable in dataspace of zero dimension size
-ADD_H5_TEST (h5diff_208 0 -c ${FILE19} ${FILE20}) 
+ADD_H5_TEST (h5diff_208 0 -c ${FILE19} ${FILE20})
 
-# non-comparable dataset with comparable attribute, and other comparable datasets. 
+# non-comparable dataset with comparable attribute, and other comparable datasets.
 # All the rest comparables should display differences.
 ADD_H5_TEST (h5diff_220 1 -c non_comparables1.h5 non_comparables2.h5 /g1)
 
@@ -1221,28 +1261,28 @@ ADD_H5_TEST (h5diff_425 1 --follow-symlinks -v ${FILE17} ${FILE17} /ext_link_to_
 ADD_H5_TEST (h5diff_450 1  --follow-symlinks -v ${DANGLE_LINK_FILE1} ${DANGLE_LINK_FILE2})
 
 # dangling links --follow-symlinks and --no-dangling-links (FILE to FILE)
-ADD_H5_TEST (h5diff_451 2  --follow-symlinks -v --no-dangling-links  ${DANGLE_LINK_FILE1} ${DANGLE_LINK_FILE2}) 
+ADD_H5_TEST (h5diff_451 2  --follow-symlinks -v --no-dangling-links  ${DANGLE_LINK_FILE1} ${DANGLE_LINK_FILE2})
 
 # try --no-dangling-links without --follow-symlinks options
 ADD_H5_TEST (h5diff_452 2  --no-dangling-links  ${FILE13} ${FILE13})
 
 # dangling link found for soft links (FILE to FILE)
-ADD_H5_TEST (h5diff_453 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13})  
+ADD_H5_TEST (h5diff_453 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13})
 
 # dangling link found for soft links (obj to obj)
-ADD_H5_TEST (h5diff_454 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_dset2 /softlink_noexist) 
+ADD_H5_TEST (h5diff_454 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_dset2 /softlink_noexist)
 
 # dangling link found for soft links (obj to obj) Both dangle links
-ADD_H5_TEST (h5diff_455 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_noexist /softlink_noexist) 
+ADD_H5_TEST (h5diff_455 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_noexist /softlink_noexist)
 
 # dangling link found for ext links (FILE to FILE)
-ADD_H5_TEST (h5diff_456 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15}) 
+ADD_H5_TEST (h5diff_456 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15})
 
 # dangling link found for ext links (obj to obj). target file exist
-ADD_H5_TEST (h5diff_457 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist1) 
+ADD_H5_TEST (h5diff_457 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist1)
 
 # dangling link found for ext links (obj to obj). target file NOT exist
-ADD_H5_TEST (h5diff_458 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist2)  
+ADD_H5_TEST (h5diff_458 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist2)
 
 # dangling link found for ext links (obj to obj). Both dangle links
 ADD_H5_TEST (h5diff_459 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_noexist1 /ext_link_noexist2)
@@ -1261,9 +1301,9 @@ ADD_H5_TEST (h5diff_468 0 -v --follow-symlinks h5diff_danglelinks1.h5 h5diff_dan
 ADD_H5_TEST (h5diff_469 1 -v --follow-symlinks h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /ext_link2)
 
 #---------------------------------------------------
-# dangling links without follow symlink 
+# dangling links without follow symlink
 # (HDFFV-7998)
-# test - soft dangle links (same and different paths), 
+# test - soft dangle links (same and different paths),
 #      - external dangle links (same and different paths)
 ADD_H5_TEST (h5diff_471 1 -v h5diff_danglelinks1.h5 h5diff_danglelinks2.h5)
 ADD_H5_TEST (h5diff_472 0 -v h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /soft_link1)
@@ -1275,7 +1315,7 @@ ADD_H5_TEST (h5diff_475 1 -v h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /ext_
 # ##############################################################################
 # # test for group diff recursivly
 # ##############################################################################
-# root 
+# root
 ADD_H5_TEST (h5diff_500 1 -v ${GRP_RECURSE_FILE1} ${GRP_RECURSE_FILE2} / /)
 ADD_H5_TEST (h5diff_501 1 -v --follow-symlinks ${GRP_RECURSE_FILE1} ${GRP_RECURSE_FILE2} / /)
 
@@ -1309,7 +1349,7 @@ ADD_H5_TEST (h5diff_513 1 -v ${GRP_RECURSE_FILE1} ${GRP_RECURSE_FILE2} /slink_gr
 ADD_H5_TEST (h5diff_514 1 -v --follow-symlinks ${GRP_RECURSE_FILE1} ${GRP_RECURSE_FILE2} /slink_grp10 /slink_grp11)
 
 ###############################################################################
-# Test for group recursive diff via multi-linked external links 
+# Test for group recursive diff via multi-linked external links
 # With follow-symlinks, file $GRP_RECURSE1_EXT and $GRP_RECURSE2_EXT1 should
 # be same with the external links.
 ###############################################################################
@@ -1332,7 +1372,7 @@ ADD_H5_TEST (h5diff_480 0 -v --exclude-path /group1/dset3 ${EXCLUDE_FILE1_1} ${E
 ADD_H5_TEST (h5diff_481 1 -v ${EXCLUDE_FILE1_1} ${EXCLUDE_FILE1_2})
 
 #
-# Different structure, different names. 
+# Different structure, different names.
 #
 # Exclude all the different objects. Expect return - same
 ADD_H5_TEST (h5diff_482 0 -v --exclude-path "/group1" --exclude-path "/dset1" ${EXCLUDE_FILE2_1} ${EXCLUDE_FILE2_2})
@@ -1364,10 +1404,10 @@ ADD_H5_TEST (h5diff_530 0 -v  ${COMP_VL_STRS_FILE} ${COMP_VL_STRS_FILE} /group /
 ADD_H5_TEST (h5diff_540 1 -v ${COMPS_ARRAY_VLEN_FILE1} ${COMPS_ARRAY_VLEN_FILE2})
 
 # ##############################################################################
-# # Test mutually exclusive options 
+# # Test mutually exclusive options
 # ##############################################################################
 #
-# Test with -d , -p and --use-system-epsilon. 
+# Test with -d , -p and --use-system-epsilon.
 ADD_H5_TEST (h5diff_640 1 -v -d 5 -p 0.05 --use-system-epsilon ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
 ADD_H5_TEST (h5diff_641 1 -v -d 5 -p 0.05 ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
 ADD_H5_TEST (h5diff_642 1 -v -p 0.05 -d 5 ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
@@ -1375,3 +1415,9 @@ ADD_H5_TEST (h5diff_643 1 -v -d 5 --use-system-epsilon ${FILE1} ${FILE2} /g1/dse
 ADD_H5_TEST (h5diff_644 1 -v --use-system-epsilon -d 5 ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
 ADD_H5_TEST (h5diff_645 1 -v -p 0.05 --use-system-epsilon ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
 ADD_H5_TEST (h5diff_646 1 -v --use-system-epsilon -p 0.05 ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
+
+# VDS
+ADD_H5_TEST (h5diff_v1 0 -v ${FILEV1} ${FILEV2})
+ADD_H5_TEST (h5diff_v2 0 -r ${FILEV1} ${FILEV2})
+ADD_H5_TEST (h5diff_v3 0 -c ${FILEV1} ${FILEV2})
+
diff --git a/tools/h5diff/testfiles/h5diff_v1.txt b/tools/h5diff/testfiles/h5diff_v1.txt
new file mode 100644
index 0000000..31a3eae
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_v1.txt
@@ -0,0 +1,18 @@
+
+file1     file2
+---------------------------------------
+    x      x    /              
+    x      x    /vds_dset      
+
+group  : </> and </>
+0 differences found
+dataset: </vds_dset> and </vds_dset>
+Not comparable: </vds_dset> or </vds_dset> is an empty dataset
+Not comparable: </vds_dset> has rank 3, dimensions [5x18x8], max dimensions [18446744073709551615x18x8]
+and </vds_dset> has rank 3, dimensions [6x8x14], max dimensions [18446744073709551615x8x14]
+0 differences found
+--------------------------------
+Some objects are not comparable
+--------------------------------
+Use -c for a list of objects without details of differences.
+EXIT CODE: 0
diff --git a/tools/h5diff/testfiles/h5diff_v2.txt b/tools/h5diff/testfiles/h5diff_v2.txt
new file mode 100644
index 0000000..aa327b1
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_v2.txt
@@ -0,0 +1,7 @@
+dataset: </vds_dset> and </vds_dset>
+0 differences found
+--------------------------------
+Some objects are not comparable
+--------------------------------
+Use -c for a list of objects.
+EXIT CODE: 0
diff --git a/tools/h5diff/testfiles/h5diff_v3.txt b/tools/h5diff/testfiles/h5diff_v3.txt
new file mode 100644
index 0000000..8c5d2a2
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_v3.txt
@@ -0,0 +1,4 @@
+Not comparable: </vds_dset> or </vds_dset> is an empty dataset
+Not comparable: </vds_dset> has rank 3, dimensions [5x18x8], max dimensions [18446744073709551615x18x8]
+and </vds_dset> has rank 3, dimensions [6x8x14], max dimensions [18446744073709551615x8x14]
+EXIT CODE: 0
diff --git a/tools/h5diff/testh5diff.sh.in b/tools/h5diff/testh5diff.sh.in
index 373558e..fec6035 100644
--- a/tools/h5diff/testh5diff.sh.in
+++ b/tools/h5diff/testh5diff.sh.in
@@ -120,6 +120,29 @@ $SRC_H5DIFF_TESTFILES/h5diff_attr_v_level2.h5
 $SRC_H5DIFF_TESTFILES/h5diff_enum_invalid_values.h5
 $SRC_H5DIFF_TESTFILES/non_comparables1.h5
 $SRC_H5DIFF_TESTFILES/non_comparables2.h5
+$SRC_TOOLS_TESTFILES/vds/1_a.h5
+$SRC_TOOLS_TESTFILES/vds/1_b.h5
+$SRC_TOOLS_TESTFILES/vds/1_c.h5
+$SRC_TOOLS_TESTFILES/vds/1_d.h5
+$SRC_TOOLS_TESTFILES/vds/1_e.h5
+$SRC_TOOLS_TESTFILES/vds/1_f.h5
+$SRC_TOOLS_TESTFILES/vds/1_vds.h5
+$SRC_TOOLS_TESTFILES/vds/2_a.h5
+$SRC_TOOLS_TESTFILES/vds/2_b.h5
+$SRC_TOOLS_TESTFILES/vds/2_c.h5
+$SRC_TOOLS_TESTFILES/vds/2_d.h5
+$SRC_TOOLS_TESTFILES/vds/2_e.h5
+$SRC_TOOLS_TESTFILES/vds/2_vds.h5
+$SRC_TOOLS_TESTFILES/vds/3_1_vds.h5
+$SRC_TOOLS_TESTFILES/vds/3_2_vds.h5
+$SRC_TOOLS_TESTFILES/vds/4_0.h5
+$SRC_TOOLS_TESTFILES/vds/4_1.h5
+$SRC_TOOLS_TESTFILES/vds/4_2.h5
+$SRC_TOOLS_TESTFILES/vds/4_vds.h5
+$SRC_TOOLS_TESTFILES/vds/5_a.h5
+$SRC_TOOLS_TESTFILES/vds/5_b.h5
+$SRC_TOOLS_TESTFILES/vds/5_c.h5
+$SRC_TOOLS_TESTFILES/vds/5_vds.h5
 "
 
 LIST_OTHER_TEST_FILES="
@@ -1110,6 +1133,13 @@ TOOLTEST h5diff_644.txt -v --use-system-epsilon -d 5 h5diff_basic1.h5 h5diff_bas
 TOOLTEST h5diff_645.txt -v -p 0.05 --use-system-epsilon h5diff_basic1.h5 h5diff_basic2.h5 /g1/dset3 /g1/dset4
 TOOLTEST h5diff_646.txt -v --use-system-epsilon -p 0.05 h5diff_basic1.h5 h5diff_basic2.h5 /g1/dset3 /g1/dset4
 
+# ##############################################################################
+# VDS tests
+# ##############################################################################
+TOOLTEST h5diff_v1.txt -v 1_vds.h5 2_vds.h5
+TOOLTEST h5diff_v2.txt -r 1_vds.h5 2_vds.h5
+TOOLTEST h5diff_v3.txt -c 1_vds.h5 2_vds.h5
+
 
 # ##############################################################################
 # # END
diff --git a/tools/h5dump/CMakeLists.txt b/tools/h5dump/CMakeLists.txt
index 47ba7a8..be08e2a 100644
--- a/tools/h5dump/CMakeLists.txt
+++ b/tools/h5dump/CMakeLists.txt
@@ -39,6 +39,8 @@ if (BUILD_TESTING)
 
   include (CMakeTestsPBITS.cmake)
 
+  include (CMakeTestsVDS.cmake)
+
   include (CMakeTestsXML.cmake)
 endif (BUILD_TESTING)
 
diff --git a/tools/h5dump/CMakeTestsVDS.cmake b/tools/h5dump/CMakeTestsVDS.cmake
new file mode 100644
index 0000000..58287fa
--- /dev/null
+++ b/tools/h5dump/CMakeTestsVDS.cmake
@@ -0,0 +1,238 @@
+
+##############################################################################
+##############################################################################
+###           T E S T I N G                                                ###
+##############################################################################
+##############################################################################
+
+  # --------------------------------------------------------------------
+  # VDS
+  # --------------------------------------------------------------------
+  #-- Copy all the HDF5 files from the test directory into the source directory
+  set (HDF5_REFERENCE_VDS
+      tvds-1.ddl
+      tvds-2.ddl
+      tvds-3_1.ddl
+      tvds-3_2.ddl
+      tvds-4.ddl
+      tvds-5.ddl
+      tvds_layout-1.ddl
+      tvds_layout-2.ddl
+      tvds_layout-3_1.ddl
+      tvds_layout-3_2.ddl
+      tvds_layout-4.ddl
+      tvds_layout-5.ddl
+  )
+  set (HDF5_REFERENCE_TEST_VDS
+      1_a.h5
+      1_b.h5
+      1_c.h5
+      1_d.h5
+      1_e.h5
+      1_f.h5
+      1_vds.h5
+      2_a.h5
+      2_b.h5
+      2_c.h5
+      2_d.h5
+      2_e.h5
+      2_vds.h5
+      3_1_vds.h5
+      3_2_vds.h5
+      4_0.h5
+      4_1.h5
+      4_2.h5
+      4_vds.h5
+      5_a.h5
+      5_b.h5
+      5_c.h5
+      5_vds.h5
+  )
+  set (HDF5_ERROR_REFERENCE_VDS
+  )
+
+  foreach (vds_h5_file ${HDF5_REFERENCE_TEST_VDS})
+    GET_FILENAME_COMPONENT(fname "${vds_h5_file}" NAME)
+    set (dest "${PROJECT_BINARY_DIR}/testfiles/vds/${fname}")
+    #message (STATUS " Copying ${vds_h5_file}")
+    add_custom_command (
+        TARGET     h5dump
+        POST_BUILD
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E copy_if_different ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/${vds_h5_file} ${dest}
+    )
+  endforeach (vds_h5_file ${HDF5_REFERENCE_TEST_VDS})
+
+
+  foreach (ddl_vds ${HDF5_REFERENCE_VDS})
+    GET_FILENAME_COMPONENT(fname "${ddl_vds}" NAME)
+    set (ddldest "${PROJECT_BINARY_DIR}/testfiles/vds/${fname}")
+    #message (STATUS " Copying ${ddl_vds}")
+    add_custom_command (
+        TARGET     h5dump
+        POST_BUILD
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E copy_if_different ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/${ddl_vds} ${ddldest}
+    )
+  endforeach (ddl_vds ${HDF5_REFERENCE_VDS})
+
+  foreach (ddl_vds ${HDF5_ERROR_REFERENCE_VDS})
+    GET_FILENAME_COMPONENT(fname "${ddl_vds}" NAME)
+    set (ddldest "${PROJECT_BINARY_DIR}/testfiles/vds/${fname}")
+    #message (STATUS " Copying ${ddl_vds}")
+    add_custom_command (
+        TARGET     h5dump
+        POST_BUILD
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E copy_if_different ${PROJECT_SOURCE_DIR}/errfiles/${ddl_vds} ${ddldest}
+    )
+  endforeach (ddl_vds ${HDF5_ERROR_REFERENCE_VDS})
+
+##############################################################################
+##############################################################################
+###           T H E   T E S T S  M A C R O S                               ###
+##############################################################################
+##############################################################################
+
+  MACRO (ADD_H5_VDS_TEST resultfile resultcode)
+    # If using memchecker add tests without using scripts
+    if (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (NAME H5DUMP-${resultfile} COMMAND $<TARGET_FILE:h5dump> ${ARGN})
+      set_tests_properties (H5DUMP-${resultfile} PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfilesvds")
+      if (NOT ${resultcode} STREQUAL "0")
+        set_tests_properties (H5DUMP-${resultfile} PROPERTIES WILL_FAIL "true")
+      endif (NOT ${resultcode} STREQUAL "0")
+      if (NOT "${last_vds_test}" STREQUAL "")
+        set_tests_properties (H5DUMP-${resultfile} PROPERTIES DEPENDS ${last_VDS_test})
+      endif (NOT "${last_vds_test}" STREQUAL "")
+    else (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5DUMP-${resultfile}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove ${resultfile}.out ${resultfile}.out.err
+      )
+      set_tests_properties (H5DUMP-${resultfile}-clear-objects PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/vds")
+      add_test (
+          NAME H5DUMP-${resultfile}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5dump>"
+              -D "TEST_ARGS:STRING=${ARGN}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles/vds"
+              -D "TEST_OUTPUT=${resultfile}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.ddl"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5DUMP-${resultfile} PROPERTIES DEPENDS "H5DUMP-${resultfile}-clear-objects")
+    endif (HDF5_ENABLE_USING_MEMCHECKER)
+  ENDMACRO (ADD_H5_VDS_TEST file)
+
+  MACRO (ADD_H5_VDS_LAYOUT resultfile resultcode)
+    # If using memchecker add tests without using scripts
+    if (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (NAME H5DUMP-${resultfile} COMMAND $<TARGET_FILE:h5dump> -p ${ARGN})
+      set_tests_properties (H5DUMP-${resultfile} PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfilesvds")
+      if (NOT ${resultcode} STREQUAL "0")
+        set_tests_properties (H5DUMP-${resultfile} PROPERTIES WILL_FAIL "true")
+      endif (NOT ${resultcode} STREQUAL "0")
+      if (NOT "${last_vds_test}" STREQUAL "")
+        set_tests_properties (H5DUMP-${resultfile} PROPERTIES DEPENDS ${last_VDS_test})
+      endif (NOT "${last_vds_test}" STREQUAL "")
+    else (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5DUMP-${resultfile}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove ${resultfile}.out ${resultfile}.out.err
+      )
+      set_tests_properties (H5DUMP-${resultfile}-clear-objects PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/vds")
+      add_test (
+          NAME H5DUMP-${resultfile}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5dump>"
+              -D "TEST_ARGS:STRING=-p;${ARGN}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles/vds"
+              -D "TEST_OUTPUT=${resultfile}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.ddl"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5DUMP-${resultfile} PROPERTIES DEPENDS "H5DUMP-${resultfile}-clear-objects")
+    endif (HDF5_ENABLE_USING_MEMCHECKER)
+  ENDMACRO (ADD_H5_VDS_LAYOUT file)
+
+##############################################################################
+##############################################################################
+###           T H E   T E S T S                                            ###
+##############################################################################
+##############################################################################
+
+  if (HDF5_ENABLE_USING_MEMCHECKER)
+    # Remove any output file left over from previous test run
+    add_test (
+      NAME H5DUMP_VDS-clearall-objects
+      COMMAND    ${CMAKE_COMMAND}
+          -E remove
+          tvds-1.out
+          tvds-1.out.err
+          tvds-2.out
+          tvds-2.out.err
+          tvds-3_1.out
+          tvds-3_1.out.err
+          tvds-3_2.out
+          tvds-3_2.out.err
+          tvds-4.out
+          tvds-4.out.err
+          tvds-5.out
+          tvds-5.out.err
+          tvds_layout-1.out
+          tvds_layout-1.out.err
+          tvds_layout-2.out
+          tvds_layout-2.out.err
+          tvds_layout-3_1.out
+          tvds_layout-3_1.out.err
+          tvds_layout-3_2.out
+          tvds_layout-3_2.out.err
+          tvds_layout-4.out
+          tvds_layout-4.out.err
+          tvds_layout-5.out
+          tvds_layout-5.out.err
+    )
+    set_tests_properties (H5DUMP_VDS-clearall-objects PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/vds")
+    if (NOT "${last_vds_test}" STREQUAL "")
+      set_tests_properties (H5DUMP_VDS-clearall-objects PROPERTIES DEPENDS ${last_vds_test})
+    endif (NOT "${last_vds_test}" STREQUAL "")
+    set (last_VDS_test "H5DUMP_VDS-clearall-objects")
+  endif (HDF5_ENABLE_USING_MEMCHECKER)
+
+# See which filters are usable (and skip tests for filters we
+# don't have).  Do this by searching H5pubconf.h to see which
+# filters are defined.
+
+# detect whether the encoder is present.
+  if (H5_HAVE_FILTER_DEFLATE)
+    set (USE_FILTER_DEFLATE "true")
+  endif (H5_HAVE_FILTER_DEFLATE)
+
+  if (H5_HAVE_FILTER_SZIP)
+    set (USE_FILTER_SZIP "true")
+  endif (H5_HAVE_FILTER_SZIP)
+
+  # Data read
+  if (USE_FILTER_DEFLATE)
+    ADD_H5_VDS_TEST (tvds-1 0 --enable-error-stack 1_vds.h5)
+    ADD_H5_VDS_TEST (tvds-2 0 --enable-error-stack 2_vds.h5)
+    ADD_H5_VDS_TEST (tvds-3_1 0 --enable-error-stack 3_1_vds.h5)
+    ADD_H5_VDS_TEST (tvds-3_2 0 --enable-error-stack 3_2_vds.h5)
+    ADD_H5_VDS_TEST (tvds-4 0 --enable-error-stack 4_vds.h5)
+    ADD_H5_VDS_TEST (tvds-5 0 --enable-error-stack 5_vds.h5)
+  endif (USE_FILTER_DEFLATE)
+
+  # Layout read
+  if (USE_FILTER_DEFLATE)
+    ADD_H5_VDS_LAYOUT (tvds_layout-1 0 --enable-error-stack 1_vds.h5)
+    ADD_H5_VDS_LAYOUT (tvds_layout-2 0 --enable-error-stack 2_vds.h5)
+    ADD_H5_VDS_LAYOUT (tvds_layout-3_1 0 --enable-error-stack 3_1_vds.h5)
+    ADD_H5_VDS_LAYOUT (tvds_layout-3_2 0 --enable-error-stack 3_2_vds.h5)
+    ADD_H5_VDS_LAYOUT (tvds_layout-4 0 --enable-error-stack 4_vds.h5)
+    ADD_H5_VDS_LAYOUT (tvds_layout-5 0 --enable-error-stack 5_vds.h5)
+  endif (USE_FILTER_DEFLATE)
diff --git a/tools/h5dump/Makefile.am b/tools/h5dump/Makefile.am
index 69227f8..4b56c96 100644
--- a/tools/h5dump/Makefile.am
+++ b/tools/h5dump/Makefile.am
@@ -24,8 +24,8 @@ include $(top_srcdir)/config/commence.am
 AM_CPPFLAGS+=-I$(top_srcdir)/src -I$(top_srcdir)/tools/lib
 
 # Test programs and scripts
-TEST_PROG= h5dumpgentest
-TEST_SCRIPT= testh5dump.sh testh5dumppbits.sh testh5dumpxml.sh
+TEST_PROG=h5dumpgentest
+TEST_SCRIPT=testh5dump.sh testh5dumppbits.sh testh5dumpvds.sh testh5dumpxml.sh
 
 check_PROGRAMS=$(TEST_PROG) binread
 check_SCRIPTS=$(TEST_SCRIPT)
diff --git a/tools/h5dump/testh5dumpvds.sh.in b/tools/h5dump/testh5dumpvds.sh.in
new file mode 100644
index 0000000..b15606f
--- /dev/null
+++ b/tools/h5dump/testh5dumpvds.sh.in
@@ -0,0 +1,505 @@
+#! /bin/sh
+#
+# Copyright by The HDF Group.
+# Copyright by the Board of Trustees of the University of Illinois.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the files COPYING and Copyright.html.  COPYING can be found at the root
+# of the source code distribution tree; Copyright.html can be found at the
+# root level of an installed copy of the electronic HDF5 document set and
+# is linked from the top-level documents page.  It can also be found at
+# http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have
+# access to either file, you may request a copy from help@hdfgroup.org.
+#
+# Tests for the h5dump tool with vds type files
+
+srcdir=@srcdir@
+
+# Determine which filters are available
+USE_FILTER_SZIP="@USE_FILTER_SZIP@"
+USE_FILTER_DEFLATE="@USE_FILTER_DEFLATE@"
+
+TESTNAME=h5dump
+EXIT_SUCCESS=0
+EXIT_FAILURE=1
+
+DUMPER=h5dump                     # The tool name
+DUMPER_BIN=`pwd`/$DUMPER          # The path of the tool binary
+
+H5DIFF=../h5diff/h5diff           # The h5diff tool name
+H5DIFF_BIN=`pwd`/$H5DIFF          # The path of the h5diff  tool binary
+
+H5IMPORT=../h5import/h5import     # The h5import tool name
+H5IMPORT_BIN=`pwd`/$H5IMPORT      # The path of the h5import  tool binary
+
+RM='rm -rf'
+CMP='cmp -s'
+DIFF='diff -c'
+CP='cp'
+DIRNAME='dirname'
+LS='ls'
+AWK='awk'
+
+nerrors=0
+verbose=yes
+
+# source dirs
+SRC_TOOLS="$srcdir/../"
+
+SRC_TOOLS_TESTFILES="$SRC_TOOLS/testfiles"
+# testfiles source dirs for tools
+SRC_H5LS_TESTFILES="$SRC_TOOLS_TESTFILES"
+SRC_H5DUMP_TESTFILES="$SRC_TOOLS_TESTFILES"
+SRC_H5DUMP_ERRORFILES="$srcdir/errfiles"
+SRC_H5DIFF_TESTFILES="$SRC_TOOLS/h5diff/testfiles"
+SRC_H5COPY_TESTFILES="$SRC_TOOLS/h5copy/testfiles"
+SRC_H5REPACK_TESTFILES="$SRC_TOOLS/h5repack/testfiles"
+SRC_H5JAM_TESTFILES="$SRC_TOOLS/h5jam/testfiles"
+SRC_H5STAT_TESTFILES="$SRC_TOOLS/h5stat/testfiles"
+SRC_H5IMPORT_TESTFILES="$SRC_TOOLS/h5import/testfiles"
+
+TEST_P_DIR=./testfiles
+TESTDIR=./testfiles/vds
+test -d $TEST_P_DIR || mkdir -p $TEST_P_DIR
+test -d $TESTDIR || mkdir -p $TESTDIR
+
+######################################################################
+# test files
+# --------------------------------------------------------------------
+# All the test files copy from source directory to test directory
+# NOTE: Keep this framework to add/remove test files.
+#       Any test files from other tools can be used in this framework.
+#       This list are also used for checking exist.
+#       Comment '#' without space can be used.
+# --------------------------------------------------------------------
+LIST_HDF5_TEST_FILES="
+$SRC_H5DUMP_TESTFILES/vds/1_a.h5
+$SRC_H5DUMP_TESTFILES/vds/1_b.h5
+$SRC_H5DUMP_TESTFILES/vds/1_c.h5
+$SRC_H5DUMP_TESTFILES/vds/1_d.h5
+$SRC_H5DUMP_TESTFILES/vds/1_e.h5
+$SRC_H5DUMP_TESTFILES/vds/1_f.h5
+$SRC_H5DUMP_TESTFILES/vds/1_vds.h5
+$SRC_H5DUMP_TESTFILES/vds/2_a.h5
+$SRC_H5DUMP_TESTFILES/vds/2_b.h5
+$SRC_H5DUMP_TESTFILES/vds/2_c.h5
+$SRC_H5DUMP_TESTFILES/vds/2_d.h5
+$SRC_H5DUMP_TESTFILES/vds/2_e.h5
+$SRC_H5DUMP_TESTFILES/vds/2_vds.h5
+$SRC_H5DUMP_TESTFILES/vds/3_1_vds.h5
+$SRC_H5DUMP_TESTFILES/vds/3_2_vds.h5
+$SRC_H5DUMP_TESTFILES/vds/4_0.h5
+$SRC_H5DUMP_TESTFILES/vds/4_1.h5
+$SRC_H5DUMP_TESTFILES/vds/4_2.h5
+$SRC_H5DUMP_TESTFILES/vds/4_vds.h5
+$SRC_H5DUMP_TESTFILES/vds/5_a.h5
+$SRC_H5DUMP_TESTFILES/vds/5_b.h5
+$SRC_H5DUMP_TESTFILES/vds/5_c.h5
+$SRC_H5DUMP_TESTFILES/vds/5_vds.h5
+"
+
+LIST_OTHER_TEST_FILES="
+$SRC_H5DUMP_TESTFILES/vds/tvds-1.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds-2.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds-3_1.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds-3_2.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds-4.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds-5.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds_layout-1.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds_layout-2.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds_layout-3_1.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds_layout-3_2.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds_layout-4.ddl
+$SRC_H5DUMP_TESTFILES/vds/tvds_layout-5.ddl
+"
+
+LIST_ERROR_TEST_FILES="
+"
+
+#
+# copy test files and expected output files from source dirs to test dir
+#
+COPY_TESTFILES="$LIST_HDF5_TEST_FILES $LIST_OTHER_TEST_FILES $LIST_ERROR_TEST_FILES"
+
+COPY_TESTFILES_TO_TESTDIR()
+{
+    # copy test files. Used -f to make sure get a new copy
+    for tstfile in $COPY_TESTFILES
+    do
+        # ignore '#' comment
+        echo $tstfile | tr -d ' ' | grep '^#' > /dev/null
+        RET=$?
+        if [ $RET -eq 1 ]; then
+            # skip cp if srcdir is same as destdir
+            # this occurs when build/test performed in source dir and
+            # make cp fail
+            SDIR=`$DIRNAME $tstfile`
+            INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
+            INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
+            if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
+              $CP -f $tstfile $TESTDIR
+                if [ $? -ne 0 ]; then
+                    echo "Error: FAILED to copy $tstfile ."
+
+                    # Comment out this to CREATE expected file
+                    exit $EXIT_FAILURE
+                fi
+            fi
+        fi
+    done
+}
+
+CLEAN_TESTFILES_AND_TESTDIR()
+{
+    # skip rm if srcdir is same as destdir
+    # this occurs when build/test performed in source dir and
+    # make cp fail
+    SDIR=`$DIRNAME $tstfile`
+    INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
+    INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
+    if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
+        $RM $TESTDIR
+    fi
+}
+
+# Print a line-line message left justified in a field of 70 characters
+# beginning with the word "Testing".
+#
+TESTING() {
+   SPACES="                                                               "
+   echo "Testing $* $SPACES" | cut -c1-70 | tr -d '\012'
+}
+
+# Source in the output filter function definitions.
+. $srcdir/../../bin/output_filter.sh
+
+# Run a test and print PASS or *FAIL*.  If a test fails then increment
+# the `nerrors' global variable and (if $verbose is set) display the
+# difference between the actual output and the expected output. The
+# expected output is given as the first argument to this function and
+# the actual output file is calculated by replacing the `.ddl' with
+# `.out'.  The actual output is not removed if $HDF5_NOCLEANUP has a
+# non-zero value.
+#
+TOOLTEST() {
+    expect="$TESTDIR/$1"
+    actual="$TESTDIR/`basename $1 .ddl`.out"
+    actual_err="$TESTDIR/`basename $1 .ddl`.err"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+    shift
+
+    # Run test.
+    TESTING $DUMPER $@
+    (
+    cd $TESTDIR
+      $RUNSERIAL $DUMPER_BIN "$@"
+    ) >$actual 2>$actual_err
+
+    # save actual and actual_err in case they are needed later.
+    cp $actual $actual_sav
+    STDOUT_FILTER $actual
+    cp $actual_err $actual_err_sav
+    STDERR_FILTER $actual_err
+    cat $actual_err >> $actual
+
+  if [ ! -f $expect ]; then
+    # Create the expect file if it doesn't yet exist.
+     echo " CREATED"
+     cp $actual $expect
+    elif $CMP $expect $actual; then
+     echo " PASSED"
+    else
+     echo "*FAILED*"
+     echo "    Expected result (*.ddl) differs from actual result (*.out)"
+   nerrors="`expr $nerrors + 1`"
+   test yes = "$verbose" && $DIFF $expect $actual |sed 's/^/    /'
+    fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+   rm -f $actual $actual_err $actual_sav $actual_err_sav $actual_ext
+    fi
+
+}
+
+
+# same as TOOLTEST1 but compares generated file to expected output
+#                   and compares the generated data file to the expected data file
+# used for the binary tests that expect a full path in -o without -b
+TOOLTEST2() {
+
+    expectdata="$TESTDIR/$1"
+    expect="$TESTDIR/`basename $1 .exp`.ddl"
+    actualdata="$TESTDIR/`basename $1 .exp`.txt"
+    actual="$TESTDIR/`basename $1 .exp`.out"
+    actual_err="$TESTDIR/`basename $1 .exp`.err"
+    shift
+
+    # Run test.
+    TESTING $DUMPER $@
+    (
+      cd $TESTDIR
+      $RUNSERIAL $DUMPER_BIN "$@"
+    ) >$actual 2>$actual_err
+    cat $actual_err >> $actual
+
+    if [ ! -f $expect ]; then
+    # Create the expect file if it doesn't yet exist.
+     echo " CREATED"
+     cp $actual $expect
+    elif $CMP $expect $actual; then
+      if [ ! -f $expectdata ]; then
+      # Create the expect data file if it doesn't yet exist.
+        echo " CREATED"
+        cp $actualdata $expectdata
+      elif $CMP $expectdata $actualdata; then
+        echo " PASSED"
+      else
+        echo "*FAILED*"
+        echo "    Expected datafile (*.exp) differs from actual datafile (*.txt)"
+        nerrors="`expr $nerrors + 1`"
+        test yes = "$verbose" && $DIFF $expectdata $actualdata |sed 's/^/    /'
+      fi
+    else
+     echo "*FAILED*"
+     echo "    Expected result (*.ddl) differs from actual result (*.out)"
+     nerrors="`expr $nerrors + 1`"
+     test yes = "$verbose" && $DIFF $expect $actual |sed 's/^/    /'
+    fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+     rm -f $actual $actualdata $actual_err
+    fi
+
+}
+
+# same as TOOLTEST but filters error stack outp
+# Extract file name, line number, version and thread IDs because they may be different
+TOOLTEST3() {
+
+    expect="$TESTDIR/$1"
+    actual="$TESTDIR/`basename $1 .ddl`.out"
+    actual_err="$TESTDIR/`basename $1 .ddl`.err"
+    actual_ext="$TESTDIR/`basename $1 .ddl`.ext"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+    shift
+
+    # Run test.
+    TESTING $DUMPER $@
+    (
+      cd $TESTDIR
+      $RUNSERIAL $DUMPER_BIN "$@"
+    ) >$actual 2>$actual_err
+
+    # save actual and actual_err in case they are needed later.
+    cp $actual $actual_sav
+    STDOUT_FILTER $actual
+    cp $actual_err $actual_err_sav
+    STDERR_FILTER $actual_err
+
+    # Extract file name, line number, version and thread IDs because they may be different
+    sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
+        -e 's/line [0-9]*/line (number)/' \
+        -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
+        -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
+        -e 's/H5Eget_auto[1-2]*/H5Eget_auto(1 or 2)/' \
+        -e 's/H5Eset_auto[1-2]*/H5Eset_auto(1 or 2)/' \
+     $actual_err > $actual_ext
+    cat $actual_ext >> $actual
+
+    if [ ! -f $expect ]; then
+    # Create the expect file if it doesn't yet exist.
+     echo " CREATED"
+     cp $actual $expect
+    elif $CMP $expect $actual; then
+     echo " PASSED"
+    else
+     echo "*FAILED*"
+     echo "    Expected result (*.ddl) differs from actual result (*.out)"
+     nerrors="`expr $nerrors + 1`"
+     test yes = "$verbose" && $DIFF $expect $actual |sed 's/^/    /'
+    fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+   rm -f $actual $actual_err $actual_sav $actual_err_sav
+    fi
+
+}
+
+# same as TOOLTEST3 but filters error stack output and compares to an error file
+# Extract file name, line number, version and thread IDs because they may be different
+TOOLTEST4() {
+
+    expect="$TESTDIR/$1"
+    expect_err="$TESTDIR/`basename $1 .ddl`.err"
+    actual="$TESTDIR/`basename $1 .ddl`.out"
+    actual_err="$TESTDIR/`basename $1 .ddl`.oerr"
+    actual_ext="$TESTDIR/`basename $1 .ddl`.ext"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+    shift
+
+    # Run test.
+    TESTING $DUMPER $@
+    (
+      cd $TESTDIR
+      $RUNSERIAL $DUMPER_BIN "$@"
+    ) >$actual 2>$actual_err
+
+    # save actual and actual_err in case they are needed later.
+    cp $actual $actual_sav
+    STDOUT_FILTER $actual
+    cp $actual_err $actual_err_sav
+    STDERR_FILTER $actual_err
+
+    # Extract file name, line number, version and thread IDs because they may be different
+    sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
+        -e 's/line [0-9]*/line (number)/' \
+        -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
+        -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
+        -e 's/H5Eget_auto[1-2]*/H5Eget_auto(1 or 2)/' \
+        -e 's/H5Eset_auto[1-2]*/H5Eset_auto(1 or 2)/' \
+     $actual_err > $actual_ext
+    #cat $actual_ext >> $actual
+
+    if [ ! -f $expect ]; then
+    # Create the expect file if it doesn't yet exist.
+     echo " CREATED"
+     cp $actual $expect
+    elif $CMP $expect $actual; then
+     if $CMP $expect_err $actual_ext; then
+      echo " PASSED"
+    else
+     echo "*FAILED*"
+     echo "    Expected result (*.err) differs from actual result (*.oerr)"
+     nerrors="`expr $nerrors + 1`"
+     test yes = "$verbose" && $DIFF $expect_err $actual_ext |sed 's/^/    /'
+    fi
+    else
+     echo "*FAILED*"
+     echo "    Expected result (*.ddl) differs from actual result (*.out)"
+     nerrors="`expr $nerrors + 1`"
+     test yes = "$verbose" && $DIFF $expect $actual |sed 's/^/    /'
+    fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+   rm -f $actual $actual_err $actual_sav $actual_err_sav
+    fi
+
+}
+
+# Print a "SKIP" message
+SKIP() {
+   TESTING $DUMPER $@
+    echo  " -SKIP-"
+}
+
+# Print a line-line message left justified in a field of 70 characters
+#
+PRINT_H5DIFF() {
+ SPACES="                                                               "
+ echo " Running h5diff $* $SPACES" | cut -c1-70 | tr -d '\012'
+}
+
+
+# Call the h5diff tool
+#
+DIFFTEST()
+{
+    PRINT_H5DIFF  $@
+    (
+  cd $TESTDIR
+  $RUNSERIAL $H5DIFF_BIN "$@" -q
+    )
+    RET=$?
+    if [ $RET != 0 ] ; then
+         echo "*FAILED*"
+         nerrors="`expr $nerrors + 1`"
+    else
+         echo " PASSED"
+    fi
+
+}
+
+# Print a line-line message left justified in a field of 70 characters
+# beginning with the word "Verifying".
+#
+PRINT_H5IMPORT() {
+ SPACES="                                                               "
+ echo " Running h5import $* $SPACES" | cut -c1-70 | tr -d '\012'
+}
+
+# Call the h5import tool
+#
+IMPORTTEST()
+{
+    # remove the output hdf5 file if it exists
+    hdf5_file="$TESTDIR/$5"
+    if [ -f $hdf5_file ]; then
+     rm -f $hdf5_file
+    fi
+
+    PRINT_H5IMPORT  $@
+    (
+  cd $TESTDIR
+  $RUNSERIAL $H5IMPORT_BIN "$@"
+    )
+    RET=$?
+    if [ $RET != 0 ] ; then
+         echo "*FAILED*"
+         nerrors="`expr $nerrors + 1`"
+    else
+         echo " PASSED"
+    fi
+
+}
+
+
+##############################################################################
+##############################################################################
+###        T H E   T E S T S                                            ###
+##############################################################################
+##############################################################################
+# prepare for test
+COPY_TESTFILES_TO_TESTDIR
+
+####### test for dataset vds ######
+
+  # Data read
+if test $USE_FILTER_DEFLATE = "yes" ; then
+    TOOLTEST tvds-1.ddl --enable-error-stack 1_vds.h5
+    TOOLTEST tvds-2.ddl --enable-error-stack 2_vds.h5
+    TOOLTEST tvds-3_1.ddl --enable-error-stack 3_1_vds.h5
+    TOOLTEST tvds-3_2.ddl --enable-error-stack 3_2_vds.h5
+    TOOLTEST tvds-4.ddl --enable-error-stack 4_vds.h5
+    TOOLTEST tvds-5.ddl --enable-error-stack 5_vds.h5
+fi
+
+  # Layout read
+if test $USE_FILTER_DEFLATE = "yes" ; then
+    TOOLTEST tvds_layout-1.ddl -p --enable-error-stack 1_vds.h5
+    TOOLTEST tvds_layout-2.ddl -p --enable-error-stack 2_vds.h5
+    TOOLTEST tvds_layout-3_1.ddl -p --enable-error-stack 3_1_vds.h5
+    TOOLTEST tvds_layout-3_2.ddl -p --enable-error-stack 3_2_vds.h5
+    TOOLTEST tvds_layout-4.ddl -p --enable-error-stack 4_vds.h5
+    TOOLTEST tvds_layout-5.ddl -p --enable-error-stack 5_vds.h5
+fi
+
+# Clean up temporary files/directories
+CLEAN_TESTFILES_AND_TESTDIR
+
+# Report test results and exit
+if test $nerrors -eq 0 ; then
+    echo "All $TESTNAME tests passed."
+    exit $EXIT_SUCCESS
+else
+    echo "$TESTNAME tests failed with $nerrors errors."
+    exit $EXIT_FAILURE
+fi
diff --git a/tools/h5ls/CMakeLists.txt b/tools/h5ls/CMakeLists.txt
index 4e96db2..6e7f00c 100644
--- a/tools/h5ls/CMakeLists.txt
+++ b/tools/h5ls/CMakeLists.txt
@@ -23,6 +23,8 @@ if (BUILD_TESTING)
 
   include (CMakeTests.cmake)
 
+  include (CMakeTestsVDS.cmake)
+
 endif (BUILD_TESTING)
 
 ##############################################################################
diff --git a/tools/h5ls/CMakeTestsVDS.cmake b/tools/h5ls/CMakeTestsVDS.cmake
new file mode 100644
index 0000000..1ef3f20
--- /dev/null
+++ b/tools/h5ls/CMakeTestsVDS.cmake
@@ -0,0 +1,149 @@
+
+##############################################################################
+##############################################################################
+###           T E S T I N G                                                ###
+##############################################################################
+##############################################################################
+
+  # --------------------------------------------------------------------
+  # Copy all the test files from source directory to test directory
+  # --------------------------------------------------------------------
+  set (LIST_HDF5_TEST_FILES
+      1_a.h5
+      1_b.h5
+      1_c.h5
+      1_d.h5
+      1_e.h5
+      1_f.h5
+      1_vds.h5
+      2_a.h5
+      2_b.h5
+      2_c.h5
+      2_d.h5
+      2_e.h5
+      2_vds.h5
+      3_1_vds.h5
+      3_2_vds.h5
+      4_0.h5
+      4_1.h5
+      4_2.h5
+      4_vds.h5
+      5_a.h5
+      5_b.h5
+      5_c.h5
+      5_vds.h5
+  )
+
+  set (LIST_OTHER_TEST_FILES
+      tvds-1.ls
+      tvds-2.ls
+      tvds-3_1.ls
+      tvds-3_2.ls
+      tvds-4.ls
+      tvds-5.ls
+  )
+
+  file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles")
+
+  # copy the list of test files
+  foreach (listfiles ${LIST_HDF5_TEST_FILES} ${LIST_OTHER_TEST_FILES})
+    GET_FILENAME_COMPONENT(fname "${listfiles}" NAME)
+    set (dest "${PROJECT_BINARY_DIR}/testfiles/vds/${fname}")
+    #message (STATUS " Copying ${listfiles} to ${dest}")
+    add_custom_command (
+        TARGET     h5ls
+        POST_BUILD
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E copy_if_different ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/${listfiles} ${dest}
+    )
+  endforeach (listfiles ${LIST_HDF5_TEST_FILES} ${LIST_OTHER_TEST_FILES})
+
+
+##############################################################################
+##############################################################################
+###           T H E   T E S T S  M A C R O S                               ###
+##############################################################################
+##############################################################################
+
+  MACRO (ADD_H5_VDS_TEST resultfile resultcode)
+    # If using memchecker add tests without using scripts
+    if (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (NAME H5LS-${resultfile} COMMAND $<TARGET_FILE:h5ls> ${ARGN})
+      set_tests_properties (H5LS-${resultfile} PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/vds")
+      if (${resultcode} STREQUAL "1")
+        set_tests_properties (H5LS-${resultfile} PROPERTIES WILL_FAIL "true")
+      endif (${resultcode} STREQUAL "1")
+      if (NOT "${last_test}" STREQUAL "")
+        set_tests_properties (H5LS-${resultfile} PROPERTIES DEPENDS ${last_test})
+      endif (NOT "${last_test}" STREQUAL "")
+    else (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5LS-${resultfile}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove ./testfiles/${resultfile}.out ./testfiles/vds/${resultfile}.out.err
+      )
+      add_test (
+          NAME H5LS-${resultfile}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5ls>"
+              -D "TEST_ARGS=${ARGN}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles/vds"
+              -D "TEST_OUTPUT=${resultfile}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.ls"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5LS-${resultfile} PROPERTIES DEPENDS "H5LS_VDS-${resultfile}-clear-objects")
+    endif (HDF5_ENABLE_USING_MEMCHECKER)
+  ENDMACRO (ADD_H5_VDS_TEST file)
+
+##############################################################################
+##############################################################################
+###           T H E   T E S T S                                            ###
+##############################################################################
+##############################################################################
+
+  if (HDF5_ENABLE_USING_MEMCHECKER)
+    # Remove any output file left over from previous test run
+    add_test (
+      NAME H5LS_VDS-clearall-objects
+      COMMAND    ${CMAKE_COMMAND}
+          -E remove
+          tvds-1.out
+          tvds-1.out.err
+          tvds-2.out
+          tvds-2.out.err
+          tvds-3_1.out
+          tvds-3_1.out.err
+          tvds-3_2.out
+          tvds-3_2.out.err
+          tvds-4.out
+          tvds-4.out.err
+          tvds-5.out
+          tvds-5.out.err
+          tvds_layout-1.out
+          tvds_layout-1.out.err
+          tvds_layout-2.out
+          tvds_layout-2.out.err
+          tvds_layout-3_1.out
+          tvds_layout-3_1.out.err
+          tvds_layout-3_2.out
+          tvds_layout-3_2.out.err
+          tvds_layout-4.out
+          tvds_layout-4.out.err
+          tvds_layout-5.out
+          tvds_layout-5.out.err
+    )
+    if (NOT "${last_test}" STREQUAL "")
+      set_tests_properties (H5LS_VDS-clearall-objects PROPERTIES DEPENDS ${last_test})
+    endif (NOT "${last_test}" STREQUAL "")
+    set (last_test "H5LS_VDS-clearall-objects")
+  endif (HDF5_ENABLE_USING_MEMCHECKER)
+
+  ADD_H5_VDS_TEST (tvds-1 0 -w80 -v -S 1_vds.h5)
+  ADD_H5_VDS_TEST (tvds-2 0 -w80 -v -S 2_vds.h5)
+  ADD_H5_VDS_TEST (tvds-3_1 0 -w80 -v -S 3_1_vds.h5)
+  ADD_H5_VDS_TEST (tvds-3_2 0 -w80 -v -S 3_2_vds.h5)
+  ADD_H5_VDS_TEST (tvds-4 0 -w80 -v -S 4_vds.h5)
+  ADD_H5_VDS_TEST (tvds-5 0 -w80 -v -S 5_vds.h5)
+
diff --git a/tools/h5ls/Makefile.am b/tools/h5ls/Makefile.am
index 408ce93..54a06f1 100644
--- a/tools/h5ls/Makefile.am
+++ b/tools/h5ls/Makefile.am
@@ -24,7 +24,7 @@ include $(top_srcdir)/config/commence.am
 AM_CPPFLAGS+=-I$(top_srcdir)/src -I$(top_srcdir)/tools/lib
 
 # Test programs and scripts
-TEST_SCRIPT=testh5ls.sh
+TEST_SCRIPT=testh5ls.sh testh5lsvds.sh
 check_SCRIPTS=$(TEST_SCRIPT)
 SCRIPT_DEPEND=h5ls$(EXEEXT)
 
diff --git a/tools/h5ls/h5ls.c b/tools/h5ls/h5ls.c
index fe146c1..cce5f3d 100644
--- a/tools/h5ls/h5ls.c
+++ b/tools/h5ls/h5ls.c
@@ -1847,6 +1847,34 @@ dataset_list2(hid_t dset, const char H5_ATTR_UNUSED *name)
                 } /* end if */
                 break;
 
+            case H5D_VIRTUAL:
+                {
+                    char dset_name[256];        /* Dataset name */
+                    size_t vmaps;
+
+                    H5Pget_virtual_count(dcpl, &vmaps);
+
+                    if (vmaps) {
+                        size_t next;
+                        ssize_t ssize_out;
+
+                        h5tools_str_append(&buffer, "    %-10s {%ld} Source {\n", "Maps:", vmaps);
+                        for (next = 0; next < (unsigned) vmaps; next++) {
+                            ssize_out = H5Pget_virtual_filename(dcpl, next, NULL, 0);
+                            H5Pget_virtual_filename(dcpl, next, f_name, sizeof(f_name));
+                            ssize_out = H5Pget_virtual_dsetname(dcpl, next, NULL, 0);
+                            H5Pget_virtual_dsetname(dcpl, next, dset_name, sizeof(dset_name));
+                            h5tools_str_append(&buffer, "    %-10s        ", " ");
+                            print_string(&buffer, f_name, TRUE);
+                            h5tools_str_append(&buffer, "   ");
+                            print_string(&buffer, dset_name, TRUE);
+                            h5tools_str_append(&buffer, "\n");
+                        }
+                        h5tools_str_append(&buffer, "     %-10s}\n", " ");
+                    }
+                }
+                break;
+
             case H5D_LAYOUT_ERROR:
             case H5D_NLAYOUTS:
             default:
diff --git a/tools/h5ls/testh5lsvds.sh.in b/tools/h5ls/testh5lsvds.sh.in
new file mode 100644
index 0000000..d194992
--- /dev/null
+++ b/tools/h5ls/testh5lsvds.sh.in
@@ -0,0 +1,258 @@
+#! /bin/sh
+#
+# Copyright by The HDF Group.
+# Copyright by the Board of Trustees of the University of Illinois.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the files COPYING and Copyright.html.  COPYING can be found at the root
+# of the source code distribution tree; Copyright.html can be found at the
+# root level of an installed copy of the electronic HDF5 document set and
+# is linked from the top-level documents page.  It can also be found at
+# http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have
+# access to either file, you may request a copy from help@hdfgroup.org.
+#
+# Tests for the h5ls tool
+
+srcdir=@srcdir@
+
+TESTNAME=h5ls
+EXIT_SUCCESS=0
+EXIT_FAILURE=1
+
+H5LS=h5ls               # The tool name
+H5LS_BIN=`pwd`/$H5LS    # The path of the tool binary
+
+RM='rm -rf'
+CMP='cmp -s'
+DIFF='diff -c'
+CP='cp'
+NLINES=20          # Max. lines of output to display if test fails
+DIRNAME='dirname'
+LS='ls'
+AWK='awk'
+
+WORDS_BIGENDIAN="@WORDS_BIGENDIAN@"
+
+nerrors=0
+verbose=yes
+h5haveexitcode=yes      # default is yes
+
+# source dirs
+SRC_TOOLS="$srcdir/.."
+SRC_TOOLS_TESTFILES="$SRC_TOOLS/testfiles"
+
+# testfiles source dirs for tools
+SRC_H5LS_TESTFILES="$SRC_TOOLS_TESTFILES"
+SRC_H5DUMP_TESTFILES="$SRC_TOOLS_TESTFILES"
+SRC_H5DIFF_TESTFILES="$SRC_TOOLS/h5diff/testfiles"
+SRC_H5COPY_TESTFILES="$SRC_TOOLS/h5copy/testfiles"
+SRC_H5REPACK_TESTFILES="$SRC_TOOLS/h5repack/testfiles"
+SRC_H5JAM_TESTFILES="$SRC_TOOLS/h5jam/testfiles"
+SRC_H5STAT_TESTFILES="$SRC_TOOLS/h5stat/testfiles"
+SRC_H5IMPORT_TESTFILES="$SRC_TOOLS/h5import/testfiles"
+
+TEST_P_DIR=./testfiles
+TESTDIR=./testfiles/vds
+test -d $TEST_P_DIR || mkdir -p $TEST_P_DIR
+test -d $TESTDIR || mkdir $TESTDIR
+
+######################################################################
+# test files
+# --------------------------------------------------------------------
+# All the test files copy from source directory to test directory
+# NOTE: Keep this framework to add/remove test files.
+#       Any test files from other tools can be used in this framework.
+#       This list are also used for checking exist.
+#       Comment '#' without space can be used.
+# --------------------------------------------------------------------
+LIST_HDF5_TEST_FILES="
+$SRC_H5LS_TESTFILES/vds/1_a.h5
+$SRC_H5LS_TESTFILES/vds/1_b.h5
+$SRC_H5LS_TESTFILES/vds/1_c.h5
+$SRC_H5LS_TESTFILES/vds/1_d.h5
+$SRC_H5LS_TESTFILES/vds/1_e.h5
+$SRC_H5LS_TESTFILES/vds/1_f.h5
+$SRC_H5LS_TESTFILES/vds/1_vds.h5
+$SRC_H5LS_TESTFILES/vds/2_a.h5
+$SRC_H5LS_TESTFILES/vds/2_b.h5
+$SRC_H5LS_TESTFILES/vds/2_c.h5
+$SRC_H5LS_TESTFILES/vds/2_d.h5
+$SRC_H5LS_TESTFILES/vds/2_e.h5
+$SRC_H5LS_TESTFILES/vds/2_vds.h5
+$SRC_H5LS_TESTFILES/vds/3_1_vds.h5
+$SRC_H5LS_TESTFILES/vds/3_2_vds.h5
+$SRC_H5LS_TESTFILES/vds/4_0.h5
+$SRC_H5LS_TESTFILES/vds/4_1.h5
+$SRC_H5LS_TESTFILES/vds/4_2.h5
+$SRC_H5LS_TESTFILES/vds/4_vds.h5
+$SRC_H5LS_TESTFILES/vds/5_a.h5
+$SRC_H5LS_TESTFILES/vds/5_b.h5
+$SRC_H5LS_TESTFILES/vds/5_c.h5
+$SRC_H5LS_TESTFILES/vds/5_vds.h5
+"
+
+LIST_OTHER_TEST_FILES="
+$SRC_H5LS_TESTFILES/vds/tvds-1.ls
+$SRC_H5LS_TESTFILES/vds/tvds-2.ls
+$SRC_H5LS_TESTFILES/vds/tvds-3_1.ls
+$SRC_H5LS_TESTFILES/vds/tvds-3_2.ls
+$SRC_H5LS_TESTFILES/vds/tvds-4.ls
+$SRC_H5LS_TESTFILES/vds/tvds-5.ls
+"
+
+
+# RUNSERIAL is used. Check if it can return exit code from executalbe correctly.
+if [ -n "$RUNSERIAL_NOEXITCODE" ]; then
+    echo "***Warning*** Serial Exit Code is not passed back to shell corretly."
+    echo "***Warning*** Exit code checking is skipped."
+    h5haveexitcode=no
+fi
+
+#
+# copy test files and expected output files from source dirs to test dir
+#
+COPY_TESTFILES="$LIST_HDF5_TEST_FILES $LIST_OTHER_TEST_FILES"
+
+COPY_TESTFILES_TO_TESTDIR()
+{
+    # copy test files. Used -f to make sure get a new copy
+    for tstfile in $COPY_TESTFILES
+    do
+        # ignore '#' comment
+        echo $tstfile | tr -d ' ' | grep '^#' > /dev/null
+        RET=$?
+        if [ $RET -eq 1 ]; then
+            # skip cp if srcdir is same as destdir
+            # this occurs when build/test performed in source dir and
+            # make cp fail
+            SDIR=`$DIRNAME $tstfile`
+            INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
+            INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
+            if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
+              $CP -f $tstfile $TESTDIR
+                if [ $? -ne 0 ]; then
+                    echo "Error: FAILED to copy $tstfile ."
+
+                    # Comment out this to CREATE expected file
+                    exit $EXIT_FAILURE
+                fi
+            fi
+        fi
+    done
+}
+
+CLEAN_TESTFILES_AND_TESTDIR()
+{
+    # skip rm if srcdir is same as destdir
+    # this occurs when build/test performed in source dir and
+    # make cp fail
+    SDIR=`$DIRNAME $tstfile`
+    INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
+    INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
+    if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
+        $RM $TESTDIR
+    fi
+}
+
+# Print a line-line message left justified in a field of 70 characters
+# beginning with the word "Testing".
+TESTING() {
+    SPACES="                                                               "
+    echo "Testing $* $SPACES" |cut -c1-70 |tr -d '\012'
+}
+
+# Source in the output filter function definitions.
+. $srcdir/../../bin/output_filter.sh
+
+# Run a test and print PASS or *FAIL*. For now, if h5ls can complete
+# with exit status 0, consider it pass. If a test fails then increment
+# the `nerrors' global variable and (if $verbose is set) display up to $NLINS
+# lines of the actual output from the tool test.  The actual output is not
+# removed if $HDF5_NOCLEANUP has a non-zero value.
+# Arguemnts:
+# $1 -- actual output filename to use
+# $2 and on -- argument for the h5ls tool
+TOOLTEST() {
+    expect="$TESTDIR/$1"
+    actual="$TESTDIR/`basename $1 .ls`.out"
+    actual_err="$TESTDIR/`basename $1 .ls`.err"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+    shift
+    retvalexpect=$1
+    shift
+
+    # Run test.
+    # Stderr is included in stdout so that the diff can detect
+    # any unexpected output from that stream too.
+    TESTING $H5LS $@
+    (
+  cd $TESTDIR
+        $RUNSERIAL $H5LS_BIN "$@"
+    ) >$actual 2>$actual_err
+
+    exitcode=$?
+    # save actual and actual_err in case they are needed later.
+    cp $actual $actual_sav
+    STDOUT_FILTER $actual
+    cp $actual_err $actual_err_sav
+    STDERR_FILTER $actual_err
+    cat $actual_err >> $actual
+    if [ $h5haveexitcode = 'yes' -a $exitcode -ne $retvalexpect ]; then
+  echo "*FAILED*"
+  nerrors="`expr $nerrors + 1`"
+  if [ yes = "$verbose" ]; then
+      echo "test returned with exit code $exitcode"
+      echo "test output: (up to $NLINES lines)"
+      head -$NLINES $actual
+      echo "***end of test output***"
+      echo ""
+  fi
+    elif [ ! -f $expect ]; then
+  # Create the expect file if it doesn't yet exist.
+        echo " CREATED"
+        cp $actual $expect
+    elif $CMP $expect $actual; then
+        echo " PASSED"
+    else
+        echo "*FAILED*"
+  echo "    Expected result differs from actual result"
+  nerrors="`expr $nerrors + 1`"
+  test yes = "$verbose" && $DIFF $expect $actual |sed 's/^/    /'
+    fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+  rm -f $actual $actual_err $actual_sav $actual_err_sav
+    fi
+}
+
+##############################################################################
+##############################################################################
+###			  T H E   T E S T S                                ###
+##############################################################################
+##############################################################################
+# prepare for test
+COPY_TESTFILES_TO_TESTDIR
+
+####### test for dataset vds ######
+
+TOOLTEST tvds-1.ls 0 -w80 -v -S 1_vds.h5
+TOOLTEST tvds-2.ls 0 -w80 -v -S 2_vds.h5
+TOOLTEST tvds-3_1.ls 0 -w80 -v -S 3_1_vds.h5
+TOOLTEST tvds-3_2.ls 0 -w80 -v -S 3_2_vds.h5
+TOOLTEST tvds-4.ls 0 -w80 -v -S 4_vds.h5
+TOOLTEST tvds-5.ls 0 -w80 -v -S 5_vds.h5
+
+# Clean up temporary files/directories
+CLEAN_TESTFILES_AND_TESTDIR
+
+if test $nerrors -eq 0 ; then
+    echo "All $TESTNAME tests passed."
+    exit $EXIT_SUCCESS
+else
+    echo "$TESTNAME tests failed with $nerrors errors."
+    exit $EXIT_FAILURE
+fi
diff --git a/tools/h5repack/CMakeTests.cmake b/tools/h5repack/CMakeTests.cmake
index dee97ed..caad5c1 100644
--- a/tools/h5repack/CMakeTests.cmake
+++ b/tools/h5repack/CMakeTests.cmake
@@ -14,14 +14,14 @@
         multi
         family
     )
-  
+
     if (DIRECT_VFD)
       set (VFD_LIST ${VFD_LIST} direct)
     endif (DIRECT_VFD)
 
     MACRO (ADD_VFD_TEST vfdname resultcode)
       add_test (
-        NAME H5REPACK-VFD-${vfdname}-h5repacktest 
+        NAME H5REPACK-VFD-${vfdname}-h5repacktest
         COMMAND "${CMAKE_COMMAND}"
             -D "TEST_PROGRAM=$<TARGET_FILE:h5repacktest>"
             -D "TEST_ARGS:STRING="
@@ -37,7 +37,7 @@
       set (last_test "H5REPACK-VFD-${vfdname}-h5repacktest")
     ENDMACRO (ADD_VFD_TEST)
   endif (HDF5_TEST_VFD)
-    
+
   # --------------------------------------------------------------------
   # Copy all the HDF5 files from the source directory into the test directory
   # --------------------------------------------------------------------
@@ -77,6 +77,30 @@
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tfamily00008.h5
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tfamily00009.h5
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tfamily00010.h5
+      # tools/testfiles/vds
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_a.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_b.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_c.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_d.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_e.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_f.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/1_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_a.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_b.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_c.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_d.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_e.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/2_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/3_1_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/3_2_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_0.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_1.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_2.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/4_vds.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_a.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_b.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_c.h5
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/vds/5_vds.h5
   )
 
   set (LIST_OTHER_TEST_FILES
@@ -346,7 +370,7 @@
       add_test (
           NAME H5REPACK_UD-${testname}-clearall-objects
           COMMAND    ${CMAKE_COMMAND}
-              -E remove 
+              -E remove
               testfiles/out-${testname}.${resultfile}
               testfiles/${testname}.${resultfile}.out
               testfiles/${testname}.${resultfile}.out.err
@@ -392,7 +416,7 @@
 ##############################################################################
 
   # --------------------------------------------------------------------
-  # test file names 
+  # test file names
   # --------------------------------------------------------------------
   set (INFO_FILE testfiles/h5repack.info)
 
@@ -415,12 +439,18 @@
   set (FILE18 h5repack_layout2.h5)
   set (FILE_REF h5repack_refs.h5)
   set (FILE_ATTR_REF h5repack_attr_refs.h5)
-  
+  set (FILEV1 1_vds.h5)
+  set (FILEV2 2_vds.h5)
+  set (FILEV3_1 3_1_vds.h5)
+  set (FILEV3_2 3_2_vds.h5)
+  set (FILEV4 4_vds.h5)
+  set (FILEV5 5_vds.h5)
+
   # Remove any output file left over from previous test run
   add_test (
       NAME H5REPACK-clearall-objects
       COMMAND    ${CMAKE_COMMAND}
-          -E remove 
+          -E remove
          ./testfiles/h5dump-help.out
          ./testfiles/h5repack_filters.h5-gzip_verbose_filters.out
          ./testfiles/h5repack_filters.h5-gzip_verbose_filters.out.err
@@ -555,12 +585,41 @@
          ./testfiles/out-meta_short_N.meta_short.h5
          ./testfiles/out-meta_long_M.meta_long.h5
          ./testfiles/out-meta_long_N.meta_long.h5
-         # from the h5repacktst
+         ./testfiles/1_vds.h5-vds_dset_compa-v.out
+         ./testfiles/1_vds.h5-vds_dset_compa-v.out.err
+         ./testfiles/1_vds.h5-vds_dset_conti-v.out
+         ./testfiles/1_vds.h5-vds_dset_conti-v.out.err
+         ./testfiles/2_vds.h5-vds_null_compa-v.out
+         ./testfiles/2_vds.h5-vds_null_compa-v.out.err
+         ./testfiles/2_vds.h5-vds_null_conti-v.out
+         ./testfiles/2_vds.h5-vds_null_conti-v.out.err
+         ./testfiles/4_vds.h5-vds_compa-v.out
+         ./testfiles/4_vds.h5-vds_compa-v.out.err
+         ./testfiles/4_vds.h5-vds_compa_compa-v.out
+         ./testfiles/4_vds.h5-vds_compa_compa-v.out.err
+         ./testfiles/4_vds.h5-vds_compa_conti-v.out
+         ./testfiles/4_vds.h5-vds_compa_conti-v.out.err
+         ./testfiles/4_vds.h5-vds_conti-v.out
+         ./testfiles/4_vds.h5-vds_conti-v.out.err
+         ./testfiles/4_vds.h5-vds_conti_compa-v.out
+         ./testfiles/4_vds.h5-vds_conti_compa-v.out.err
+         ./testfiles/4_vds.h5-vds_conti_conti-v.out
+         ./testfiles/4_vds.h5-vds_conti_conti-v.out.err
+         ./testfiles/out-vds_compa.4_vds.h5
+         ./testfiles/out-vds_compa_compa.4_vds.h5
+         ./testfiles/out-vds_compa_conti.4_vds.h5
+         ./testfiles/out-vds_conti.4_vds.h5
+         ./testfiles/out-vds_conti_compa.4_vds.h5
+         ./testfiles/out-vds_conti_conti.4_vds.h5
+         ./testfiles/out-vds_dset_compa.1_vds.h5
+         ./testfiles/out-vds_dset_conti.1_vds.h5
+         ./testfiles/out-vds_null_compa.2_vds.h5
+         ./testfiles/out-vds_null_conti.2_vds.h5
          h5repack_attr.h5
          h5repack_attr_out.h5
          h5repack_attr_refs.h5
          h5repack_big.h5
-         h5repack_deflate.h5 
+         h5repack_deflate.h5
          h5repack_deflate_out.h5
          h5repack_early2.h5
          h5repack_early.h5
@@ -588,7 +647,7 @@
          h5repack_refs.h5
          h5repack_shuffle.h5
          h5repack_shuffle_out.h5
-         h5repack_soffset.h5 
+         h5repack_soffset.h5
          h5repack_soffset_out.h5
          h5repack_szip.h5
          h5repack_szip_out.h5
@@ -628,14 +687,14 @@
 # Each run generates "<file>.out.h5" and the tool h5diff is used to
 # compare the input and output files
 #
-# the tests are the same as the program h5repacktst, but run from the CLI 
+# the tests are the same as the program h5repacktst, but run from the CLI
 #
 
 # See which filters are usable (and skip tests for filters we
 # don't have).  Do this by searching H5pubconf.h to see which
 # filters are defined.
 
-# detect whether the encoder is present. 
+# detect whether the encoder is present.
   set (USE_FILTER_SZIP_ENCODER "no")
   if (HDF5_ENABLE_SZIP_ENCODING)
     set (USE_FILTER_SZIP_ENCODER ${testh5repack_detect_szip})
@@ -649,7 +708,7 @@
     set (USE_FILTER_SZIP "true")
   endif (H5_HAVE_FILTER_SZIP)
 
-# copy files (these files have no filters) 
+# copy files (these files have no filters)
   ADD_H5_TEST (fill "TEST" ${FILE0})
   ADD_H5_TEST (objs "TEST" ${FILE1})
   ADD_H5_TEST (attr "TEST" ${FILE2})
@@ -666,8 +725,8 @@
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_DEFLATE)
   ADD_H5_TEST (gzip_individual ${TESTTYPE} ${arg})
-  
-# gzip for all 
+
+# gzip for all
   set (arg ${FILE4} -f GZIP=1)
   set (TESTTYPE "TEST")
   if (NOT USE_FILTER_DEFLATE)
@@ -681,7 +740,7 @@
   if (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP)
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP)
-  ADD_H5_TEST (szip_individual ${TESTTYPE} ${arg}) 
+  ADD_H5_TEST (szip_individual ${TESTTYPE} ${arg})
 
 # szip for all
   set (arg ${FILE4} -f SZIP=8,NN)
@@ -689,16 +748,16 @@
   if (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP)
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP)
-  ADD_H5_TEST (szip_all ${TESTTYPE} ${arg}) 
+  ADD_H5_TEST (szip_all ${TESTTYPE} ${arg})
 
 # shuffle with individual object
   set (arg ${FILE4} -f dset2:SHUF  -l dset2:CHUNK=20x10)
-  ADD_H5_TEST (shuffle_individual "TEST" ${arg}) 
+  ADD_H5_TEST (shuffle_individual "TEST" ${arg})
 
 # shuffle for all
   set (arg ${FILE4} -f SHUF)
   ADD_H5_TEST (shuffle_all "TEST" ${arg})
-  
+
 # fletcher32  with individual object
   set (arg ${FILE4} -f dset2:FLET  -l dset2:CHUNK=20x10)
   ADD_H5_TEST (fletcher_individual "TEST" ${arg})
@@ -722,7 +781,7 @@
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_DEFLATE)
   ADD_H5_CMP_TEST (gzip_verbose_filters "O?...ing file[^\n]+\n" ${TESTTYPE} 0 ${arg})
-  
+
 ###########################################################
 # the following tests assume the input files have filters
 ###########################################################
@@ -734,7 +793,7 @@
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP)
   ADD_H5_TEST (szip_copy ${TESTTYPE} ${arg})
-  
+
 # szip remove
   set (arg ${FILE7} --filter=dset_szip:NONE)
   set (TESTTYPE "TEST")
@@ -742,7 +801,7 @@
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP)
   ADD_H5_TEST (szip_remove ${TESTTYPE} ${arg})
-  
+
 # deflate copy
   set (arg ${FILE8})
   set (TESTTYPE "TEST")
@@ -758,7 +817,7 @@
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_DEFLATE)
   ADD_H5_TEST (deflate_remove ${TESTTYPE} ${arg})
-    
+
 # shuffle copy
   set (arg ${FILE9})
   ADD_H5_TEST (shuffle_copy "TEST" ${arg})
@@ -813,14 +872,14 @@
   if (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP OR NOT USE_FILTER_DEFLATE)
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_SZIP OR NOT USE_FILTER_DEFLATE)
-  ADD_H5_TEST (deflate_convert ${TESTTYPE} ${arg}) 
+  ADD_H5_TEST (deflate_convert ${TESTTYPE} ${arg})
 
   set (arg ${FILE7} -f dset_szip:GZIP=1)
   set (TESTTYPE "TEST")
   if (NOT USE_FILTER_SZIP OR NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_DEFLATE)
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_SZIP OR NOT USE_FILTER_SZIP_ENCODER OR NOT USE_FILTER_DEFLATE)
-  ADD_H5_TEST (szip_convert ${TESTTYPE} ${arg}) 
+  ADD_H5_TEST (szip_convert ${TESTTYPE} ${arg})
 
 #limit
   set (arg ${FILE4} -f GZIP=1 -m 1024)
@@ -836,7 +895,7 @@
   if (NOT USE_FILTER_DEFLATE)
     set (TESTTYPE "SKIP")
   endif (NOT USE_FILTER_DEFLATE)
-  ADD_H5_TEST (deflate_file ${TESTTYPE} ${arg}) 
+  ADD_H5_TEST (deflate_file ${TESTTYPE} ${arg})
 
 #########################################################
 # layout options (these files have no filters)
@@ -865,18 +924,18 @@
   ADD_H5_VERIFY_TEST (contig_small_compa "TEST" 0 ${FILE18} contig_small COMPACT -l contig_small:COMPA)
   ADD_H5_VERIFY_TEST (contig_small_fixed_compa "TEST" 0 ${FILE18} chunked_small_fixed COMPACT -l chunked_small_fixed:COMPA)
 
-#--------------------------------------------------------------------------- 
-# Test file contains chunked datasets (need multiple dsets) with 
+#---------------------------------------------------------------------------
+# Test file contains chunked datasets (need multiple dsets) with
 # unlimited max dims.   (HDFFV-7933)
 # Use first dset to test.
 #---------------------------------------------------------------------------
 # chunk to chunk - specify chunk dim bigger than any current dim
   ADD_H5_VERIFY_TEST (chunk2chunk "TEST" 0 h5repack_layout3.h5 chunk_unlimit1 CHUNK -l chunk_unlimit1:CHUNK=100x300)
 
-# chunk to contiguous 
+# chunk to contiguous
   ADD_H5_VERIFY_TEST (chunk2conti "TEST" 0 h5repack_layout3.h5 chunk_unlimit1 CONTI -l chunk_unlimit1:CONTI)
 
-# chunk to compact - convert big dataset (should be > 64k) for this purpose, 
+# chunk to compact - convert big dataset (should be > 64k) for this purpose,
 # should remain as original layout (chunk)
   ADD_H5_VERIFY_TEST (chunk2compa "TEST" 0 h5repack_layout3.h5 chunk_unlimit1 CHUNK -l chunk_unlimit1:COMPA)
 
@@ -884,7 +943,7 @@
 # Test -f for some specific cases. Chunked dataset with unlimited max dims.
 # (HDFFV-8012)
 #--------------------------------------------------------------------------
-# - should not fail 
+# - should not fail
 # - should not change max dims from unlimit
 
 # chunk dim is bigger than dataset dim. ( dset size < 64k )
@@ -900,13 +959,13 @@
   ADD_H5_TEST (error4 "TEST" h5repack_layout3.h5 -f NONE)
 
 #--------------------------------------------------------------------------
-# Test base: Convert CHUNK to CONTI for a chunked dataset with small dataset 
+# Test base: Convert CHUNK to CONTI for a chunked dataset with small dataset
 # (dset size < 64K) and with unlimited max dims on a condition as follow.
 # (HDFFV-8214)
 #--------------------------------------------------------------------------
 # chunk dim is bigger than dataset dim. should succeed.
   ADD_H5_VERIFY_TEST (ckdim_biger "TEST" 0 h5repack_layout3.h5 chunk_unlimit2 CONTI -l chunk_unlimit2:CONTI)
-# chunk dim is smaller than dataset dim. should succeed.  
+# chunk dim is smaller than dataset dim. should succeed.
   ADD_H5_VERIFY_TEST (ckdim_smaller "TEST" 0 h5repack_layout3.h5 chunk_unlimit3 CONTI -l chunk_unlimit3:CONTI)
 
 
@@ -975,11 +1034,11 @@
   ADD_H5_TEST (bug1814 "TEST" ${FILE_REF})
 
 # test attribute with various references (bug1797 / HDFFV-5932)
-# the references in attribute of compund or vlen datatype 
+# the references in attribute of compund or vlen datatype
   ADD_H5_TEST (HDFFV-5932 "TEST" ${FILE_ATTR_REF})
 
-# Add test for memory leak in attirbute. This test is verified by CTEST.   
-# 1. leak from vlen string  
+# Add test for memory leak in attirbute. This test is verified by CTEST.
+# 1. leak from vlen string
 # 2. leak from compound type without reference member
 # (HDFFV-7840, )
 # Note: this test is experimental for sharing test file among tools
@@ -989,6 +1048,26 @@
   ADD_H5_TEST_META (meta_short h5repack_layout.h5 -M 8192)
   ADD_H5_TEST_META (meta_long h5repack_layout.h5 --metadata_block_size=8192)
 
+# VDS tests
+
+#########################################################
+# layout options
+#########################################################
+  ADD_H5_VERIFY_TEST (vds_dset_conti "TEST" 0 ${FILEV1} vds_dset CONTIGUOUS -l vds_dset:CONTI)
+  ADD_H5_VERIFY_TEST (vds_null_conti "TEST" 1 ${FILEV2} null CONTIGUOUS -l CONTI)
+  ADD_H5_VERIFY_TEST (vds_dset_compa "TEST" 0 ${FILEV1} vds_dset COMPACT -l vds_dset:COMPA)
+  ADD_H5_VERIFY_TEST (vds_null_compa "TEST" 1 ${FILEV2} null COMPACT -l COMPA)
+
+################################################################
+# layout conversions
+###############################################################
+  ADD_H5_VERIFY_TEST (vds_compa_conti "TEST" 0 ${FILEV4} vds_dset CONTIGUOUS -l vds_dset:CONTI)
+  ADD_H5_VERIFY_TEST (vds_compa_compa "TEST" 0 ${FILEV4} vds_dset COMPACT -l vds_dset:COMPA)
+  ADD_H5_VERIFY_TEST (vds_conti_compa "TEST" 0 ${FILEV4} vds_dset COMPACT -l vds_dset:COMPA)
+  ADD_H5_VERIFY_TEST (vds_conti_conti "TEST" 0 ${FILEV4} vds_dset CONTIGUOUS -l vds_dset:CONTI)
+  ADD_H5_VERIFY_TEST (vds_compa "TEST" 0 ${FILEV4} vds_dset COMPACT -l vds_dset:COMPA)
+  ADD_H5_VERIFY_TEST (vds_conti "TEST" 0 ${FILEV4} vds_dset CONTIGUOUS -l vds_dset:CONTI)
+
 ##############################################################################
 ###    P L U G I N  T E S T S
 ##############################################################################
diff --git a/tools/h5repack/h5repack.sh.in b/tools/h5repack/h5repack.sh.in
index 1796151..24298d0 100644
--- a/tools/h5repack/h5repack.sh.in
+++ b/tools/h5repack/h5repack.sh.in
@@ -113,6 +113,29 @@ $SRC_TOOLS_TESTFILES/tfamily00007.h5
 $SRC_TOOLS_TESTFILES/tfamily00008.h5
 $SRC_TOOLS_TESTFILES/tfamily00009.h5
 $SRC_TOOLS_TESTFILES/tfamily00010.h5
+$SRC_TOOLS_TESTFILES/vds/1_a.h5
+$SRC_TOOLS_TESTFILES/vds/1_b.h5
+$SRC_TOOLS_TESTFILES/vds/1_c.h5
+$SRC_TOOLS_TESTFILES/vds/1_d.h5
+$SRC_TOOLS_TESTFILES/vds/1_e.h5
+$SRC_TOOLS_TESTFILES/vds/1_f.h5
+$SRC_TOOLS_TESTFILES/vds/1_vds.h5
+$SRC_TOOLS_TESTFILES/vds/2_a.h5
+$SRC_TOOLS_TESTFILES/vds/2_b.h5
+$SRC_TOOLS_TESTFILES/vds/2_c.h5
+$SRC_TOOLS_TESTFILES/vds/2_d.h5
+$SRC_TOOLS_TESTFILES/vds/2_e.h5
+$SRC_TOOLS_TESTFILES/vds/2_vds.h5
+$SRC_TOOLS_TESTFILES/vds/3_1_vds.h5
+$SRC_TOOLS_TESTFILES/vds/3_2_vds.h5
+$SRC_TOOLS_TESTFILES/vds/4_0.h5
+$SRC_TOOLS_TESTFILES/vds/4_1.h5
+$SRC_TOOLS_TESTFILES/vds/4_2.h5
+$SRC_TOOLS_TESTFILES/vds/4_vds.h5
+$SRC_TOOLS_TESTFILES/vds/5_a.h5
+$SRC_TOOLS_TESTFILES/vds/5_b.h5
+$SRC_TOOLS_TESTFILES/vds/5_c.h5
+$SRC_TOOLS_TESTFILES/vds/5_vds.h5
 "
 
 LIST_OTHER_TEST_FILES="
@@ -1063,6 +1086,26 @@ TOOLTEST HDFFV-7840 h5diff_attr1.h5
 TOOLTEST_META meta_short h5repack_layout.h5 -M 8192
 TOOLTEST_META meta_long h5repack_layout.h5 --metadata_block_size=8192
 
+# VDS tests
+
+#########################################################
+# layout options
+#########################################################
+VERIFY_LAYOUT_DSET vds_dset_conti 1_vds.h5 vds_dset CONTIGUOUS -l vds_dset:CONTI
+VERIFY_LAYOUT_ALL vds_null_conti 2_vds.h5 CONTIGUOUS -l CONTI
+VERIFY_LAYOUT_DSET vds_dset_compa 1_vds.h5 vds_dset COMPACT -l vds_dset:COMPA
+VERIFY_LAYOUT_ALL vds_null_compa 2_vds.h5 COMPACT -l COMPA
+
+################################################################
+# layout conversions
+###############################################################
+VERIFY_LAYOUT_DSET vds_compa_conti 4_vds.h5 vds_dset CONTIGUOUS -l vds_dset:CONTI
+VERIFY_LAYOUT_DSET vds_compa_compa 4_vds.h5 vds_dset COMPACT -l vds_dset:COMPA
+VERIFY_LAYOUT_DSET vds_conti_compa 4_vds.h5 vds_dset COMPACT -l vds_dset:COMPA
+VERIFY_LAYOUT_DSET vds_conti_conti 4_vds.h5 vds_dset CONTIGUOUS -l vds_dset:CONTI
+VERIFY_LAYOUT_DSET vds_compa 4_vds.h5 vds_dset COMPACT -l vds_dset:COMPA
+VERIFY_LAYOUT_DSET vds_conti 4_vds.h5 vds_dset CONTIGUOUS -l vds_dset:CONTI
+
 # Clean up temporary files/directories
 CLEAN_TESTFILES_AND_TESTDIR
 
diff --git a/tools/h5stat/h5stat.c b/tools/h5stat/h5stat.c
index c19aba5..ac6ca23 100644
--- a/tools/h5stat/h5stat.c
+++ b/tools/h5stat/h5stat.c
@@ -1342,8 +1342,8 @@ print_dataset_info(const iter_t *iter)
 
         printf("Dataset layout information:\n");
         for(u = 0; u < H5D_NLAYOUTS; u++)
-        printf("\tDataset layout counts[%s]: %lu\n", (u == 0 ? "COMPACT" :
-                (u == 1 ? "CONTIG" : "CHUNKED")), iter->dset_layouts[u]);
+        printf("\tDataset layout counts[%s]: %lu\n", (u == H5D_COMPACT ? "COMPACT" :
+                (u == H5D_CONTIGUOUS ? "CONTIG" : (u == H5D_CHUNKED ? "CHUNKED" : "VIRTUAL"))), iter->dset_layouts[u]);
         printf("\tNumber of external files : %lu\n", iter->nexternal);
 
         printf("Dataset filters information:\n");
diff --git a/tools/h5stat/testfiles/h5stat_dims1.ddl b/tools/h5stat/testfiles/h5stat_dims1.ddl
index c285ea4..07b2900 100644
--- a/tools/h5stat/testfiles/h5stat_dims1.ddl
+++ b/tools/h5stat/testfiles/h5stat_dims1.ddl
@@ -31,6 +31,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 0
 	Dataset layout counts[CONTIG]: 23
 	Dataset layout counts[CHUNKED]: 0
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 0
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_dims2.ddl b/tools/h5stat/testfiles/h5stat_dims2.ddl
index 769749e..dbccd05 100644
--- a/tools/h5stat/testfiles/h5stat_dims2.ddl
+++ b/tools/h5stat/testfiles/h5stat_dims2.ddl
@@ -22,6 +22,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 0
 	Dataset layout counts[CONTIG]: 23
 	Dataset layout counts[CHUNKED]: 0
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 0
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_filters-d.ddl b/tools/h5stat/testfiles/h5stat_filters-d.ddl
index 2e0bd64..6e6dd61 100644
--- a/tools/h5stat/testfiles/h5stat_filters-d.ddl
+++ b/tools/h5stat/testfiles/h5stat_filters-d.ddl
@@ -18,6 +18,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 1
 	Dataset layout counts[CONTIG]: 2
 	Dataset layout counts[CHUNKED]: 12
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 2
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_filters-dT.ddl b/tools/h5stat/testfiles/h5stat_filters-dT.ddl
index 9ef3e82..b14ca9f 100644
--- a/tools/h5stat/testfiles/h5stat_filters-dT.ddl
+++ b/tools/h5stat/testfiles/h5stat_filters-dT.ddl
@@ -18,6 +18,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 1
 	Dataset layout counts[CONTIG]: 2
 	Dataset layout counts[CHUNKED]: 12
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 2
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_filters.ddl b/tools/h5stat/testfiles/h5stat_filters.ddl
index 24522cd..1a4fd72 100644
--- a/tools/h5stat/testfiles/h5stat_filters.ddl
+++ b/tools/h5stat/testfiles/h5stat_filters.ddl
@@ -56,6 +56,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 1
 	Dataset layout counts[CONTIG]: 2
 	Dataset layout counts[CHUNKED]: 12
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 2
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_links2.ddl b/tools/h5stat/testfiles/h5stat_links2.ddl
index 09bf937..4622884 100644
--- a/tools/h5stat/testfiles/h5stat_links2.ddl
+++ b/tools/h5stat/testfiles/h5stat_links2.ddl
@@ -64,6 +64,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 0
 	Dataset layout counts[CONTIG]: 23
 	Dataset layout counts[CHUNKED]: 0
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 0
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_newgrat.ddl b/tools/h5stat/testfiles/h5stat_newgrat.ddl
index 33d756b..e305f58 100644
--- a/tools/h5stat/testfiles/h5stat_newgrat.ddl
+++ b/tools/h5stat/testfiles/h5stat_newgrat.ddl
@@ -54,6 +54,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 0
 	Dataset layout counts[CONTIG]: 1
 	Dataset layout counts[CHUNKED]: 0
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 0
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_numattrs2.ddl b/tools/h5stat/testfiles/h5stat_numattrs2.ddl
index 1313aec..ccb23c1 100644
--- a/tools/h5stat/testfiles/h5stat_numattrs2.ddl
+++ b/tools/h5stat/testfiles/h5stat_numattrs2.ddl
@@ -65,6 +65,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 0
 	Dataset layout counts[CONTIG]: 23
 	Dataset layout counts[CHUNKED]: 0
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 0
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/h5stat/testfiles/h5stat_tsohm.ddl b/tools/h5stat/testfiles/h5stat_tsohm.ddl
index 37de79b..4cf33fc 100644
--- a/tools/h5stat/testfiles/h5stat_tsohm.ddl
+++ b/tools/h5stat/testfiles/h5stat_tsohm.ddl
@@ -53,6 +53,7 @@ Dataset layout information:
 	Dataset layout counts[COMPACT]: 0
 	Dataset layout counts[CONTIG]: 0
 	Dataset layout counts[CHUNKED]: 3
+	Dataset layout counts[VIRTUAL]: 0
 	Number of external files : 0
 Dataset filters information:
 	Number of datasets with:
diff --git a/tools/lib/h5tools.h b/tools/lib/h5tools.h
index ff7cf12..d2e3ea6 100644
--- a/tools/lib/h5tools.h
+++ b/tools/lib/h5tools.h
@@ -93,6 +93,16 @@
 #define PACKED_BITS     "PACKED_BITS"
 #define PACKED_OFFSET   "OFFSET"
 #define PACKED_LENGTH   "LENGTH"
+#define VDS_VIRTUAL     "VIRTUAL"
+#define VDS_MAPPING     "MAPPING"
+#define VDS_SOURCE      "SOURCE"
+#define VDS_REG_HYPERSLAB   "SELECTION REGULAR_HYPERSLAB"
+#define VDS_IRR_HYPERSLAB   "SELECTION IRREGULAR_HYPERSLAB"
+#define VDS_POINT       "POINT"
+#define VDS_SRC_FILE    "FILE"
+#define VDS_SRC_DATASET "DATASET"
+#define VDS_NONE        "SELECTION NONE"
+#define VDS_ALL         "SELECTION ALL"
 
 #define BEGIN           "{"
 #define END             "}"
@@ -182,6 +192,15 @@ typedef struct h5tools_dump_header_t {
     const char *dataspacedimbegin;
     const char *dataspacedimend;
 
+    const char *virtualselectionbegin;
+    const char *virtualselectionend;
+    const char *virtualselectionblockbegin;
+    const char *virtualselectionblockend;
+    const char *virtualfilenamebegin;
+    const char *virtualfilenameend;
+    const char *virtualdatasetnamebegin;
+    const char *virtualdatasetnameend;
+
 } h5tools_dump_header_t;
 
 /*
diff --git a/tools/lib/h5tools_dump.c b/tools/lib/h5tools_dump.c
index 1e6e9d6..0d39981 100644
--- a/tools/lib/h5tools_dump.c
+++ b/tools/lib/h5tools_dump.c
@@ -179,6 +179,15 @@ BLOCK, /*blockbegin */
 "", /*dataspacedescriptionend */
 "(", /*dataspacedimbegin */
 ")", /*dataspacedimend */
+
+"", /*virtualselectionbegin */
+"", /*virtualselectionend */
+"{", /*virtualselectionblockbegin */
+"}", /*virtualselectionblockend */
+"\"", /*virtualfilenamebeginbegin */
+"\"", /*virtualfilenamebeginend */
+"\"", /*virtualdatasetnamebegin */
+"\"", /*virtualdtatasetnameend */
 };
 
 const h5tools_dump_header_t* h5tools_dump_header_format;
@@ -216,6 +225,13 @@ void h5tools_print_dims(h5tools_str_t *buffer, hsize_t *s, int dims);
 void h5tools_dump_subsetting_header(FILE *stream, const h5tool_format_t *info,
         h5tools_context_t *ctx, struct subset_t *sset, int dims);
 
+static void h5tools_print_virtual_selection(hid_t vspace,
+        FILE *stream, const h5tool_format_t *info,
+        h5tools_context_t *ctx/*in,out*/,
+        h5tools_str_t *buffer/*string into which to render */,
+        hsize_t *curr_pos/*total data element position*/,
+        size_t ncols);
+
 void
 h5tools_dump_init(void)
 {
@@ -1523,6 +1539,7 @@ h5tools_dump_simple_dset(FILE *stream, const h5tool_format_t *info, h5tools_cont
     /* Hyperslab info */
     hsize_t             hs_offset[H5S_MAX_RANK];  /* starting offset */
     hsize_t             hs_size[H5S_MAX_RANK];    /* size this pass */
+    //hsize_t             hs_count[H5S_MAX_RANK];    /* size this pass */
     hsize_t             hs_nelmts;                /* elements in request */
 
     /* VL data special information */
@@ -1605,9 +1622,11 @@ h5tools_dump_simple_dset(FILE *stream, const h5tool_format_t *info, h5tools_cont
                 hs_size[i] = MIN(total_size[i] - hs_offset[i], sm_size[i]);
                 ctx->p_max_idx[i] = ctx->p_min_idx[i] + hs_size[i];
                 hs_nelmts *= hs_size[i];
+//                hs_count[i] = 1;
             }
 
             H5Sselect_hyperslab(f_space, H5S_SELECT_SET, hs_offset, NULL, hs_size, NULL);
+//            H5Sselect_hyperslab(f_space, H5S_SELECT_SET, hs_offset, NULL, hs_count, hs_size);
             H5Sselect_hyperslab(sm_space, H5S_SELECT_SET, zero, NULL, &hs_nelmts, NULL);
         }
         else {
@@ -2844,7 +2863,78 @@ h5tools_dump_oid(FILE *stream, const h5tool_format_t *info,
     h5tools_str_close(&buffer);
 }
 
+/*-------------------------------------------------------------------------
+ * Function:    print_virtual_selection
+ *
+ * Purpose:     Print the virtual dataset selection.
+ *
+ * Return:      void
+ *-------------------------------------------------------------------------
+ */
+static void
+h5tools_print_virtual_selection(hid_t vspace, 
+        FILE *stream, const h5tool_format_t *info,
+        h5tools_context_t *ctx/*in,out*/,
+        h5tools_str_t *buffer/*string into which to render */,
+        hsize_t *curr_pos/*total data element position*/,
+        size_t ncols)
+{
+    switch(H5Sget_select_type(vspace)) {
+        case H5S_SEL_NONE:    /* Nothing selected         */
+            ctx->need_prefix = TRUE;
+            h5tools_simple_prefix(stream, info, ctx, *curr_pos, 0);
+
+            h5tools_str_reset(buffer);
+            h5tools_str_append(buffer, "%s", VDS_NONE);
+            break;
+        case H5S_SEL_POINTS:    /* Sequence of points selected  */
+            h5tools_str_reset(buffer);
+            h5tools_str_append(buffer, "%s %s ", VDS_POINT, h5tools_dump_header_format->virtualselectionblockbegin);
+            h5tools_str_dump_space_points(buffer, vspace, info);
+            h5tools_str_append(buffer, " %s", h5tools_dump_header_format->virtualselectionblockend);
+            break;
+        case H5S_SEL_HYPERSLABS:    /* "New-style" hyperslab selection defined  */
+            ctx->need_prefix = TRUE;
+            h5tools_simple_prefix(stream, info, ctx, *curr_pos, 0);
+
+            h5tools_str_reset(buffer);
+            if (H5Sis_regular_hyperslab(vspace)) {
+                h5tools_str_append(buffer, "%s %s ", VDS_REG_HYPERSLAB, h5tools_dump_header_format->virtualselectionblockbegin);
+                h5tools_render_element(stream, info, ctx, buffer, curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                h5tools_str_reset(buffer);
+                h5tools_str_dump_space_slabs(buffer, vspace, info, ctx);
+            }
+            else {
+                h5tools_str_append(buffer, "%s %s ", VDS_IRR_HYPERSLAB, h5tools_dump_header_format->virtualselectionblockbegin);
+                h5tools_render_element(stream, info, ctx, buffer, curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+                ctx->indent_level++;
+                ctx->need_prefix = TRUE;
+                h5tools_simple_prefix(stream, info, ctx, *curr_pos, 0);
+
+                h5tools_str_reset(buffer);
+                h5tools_str_dump_space_blocks(buffer, vspace, info);
+                ctx->indent_level--;
+            }
+            h5tools_render_element(stream, info, ctx, buffer, curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+            ctx->need_prefix = TRUE;
+            h5tools_simple_prefix(stream, info, ctx, *curr_pos, 0);
+
+            h5tools_str_reset(buffer);
+            h5tools_str_append(buffer, "%s", h5tools_dump_header_format->virtualselectionblockend);
+            break;
+        case H5S_SEL_ALL:    /* Entire extent selected   */
+            ctx->need_prefix = TRUE;
+            h5tools_simple_prefix(stream, info, ctx, *curr_pos, 0);
 
+            h5tools_str_reset(buffer);
+            h5tools_str_append(buffer, "%s", VDS_ALL);
+            break;
+        default:
+            h5tools_str_append(buffer, "Unknown Selection");
+    }
+    h5tools_render_element(stream, info, ctx, buffer, curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+}
 
 /*-------------------------------------------------------------------------
  * Function:    dump_fill_value
@@ -2932,14 +3022,13 @@ h5tools_dump_dcpl(FILE *stream, const h5tool_format_t *info,
     h5tools_str_append(&buffer, "%s %s", STORAGE_LAYOUT, BEGIN);
     h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t)ncols, (hsize_t)0, (hsize_t)0);
 
-    ctx->indent_level++;
-
-    ctx->need_prefix = TRUE;
-    h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
-
     stl = H5Pget_layout(dcpl_id);
     switch (stl) {
         case H5D_CHUNKED:
+            ctx->indent_level++;
+            ctx->need_prefix = TRUE;
+            h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
             h5tools_str_reset(&buffer);
             h5tools_str_append(&buffer, "%s ", CHUNKED);
 
@@ -3002,8 +3091,13 @@ h5tools_dump_dcpl(FILE *stream, const h5tool_format_t *info,
                 h5tools_str_append(&buffer, "SIZE " HSIZE_T_FORMAT, storage_size);
             }
             h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+            ctx->indent_level--;
             break;
         case H5D_COMPACT:
+            ctx->indent_level++;
+            ctx->need_prefix = TRUE;
+            h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
             h5tools_str_reset(&buffer);
             h5tools_str_append(&buffer, "%s", COMPACT);
             h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
@@ -3014,6 +3108,7 @@ h5tools_dump_dcpl(FILE *stream, const h5tool_format_t *info,
             h5tools_str_reset(&buffer);
             h5tools_str_append(&buffer, "SIZE " HSIZE_T_FORMAT, storage_size);
             h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+            ctx->indent_level--;
             break;
         case H5D_CONTIGUOUS:
             {
@@ -3025,7 +3120,11 @@ h5tools_dump_dcpl(FILE *stream, const h5tool_format_t *info,
                  * EXTERNAL_FILE
                  *-------------------------------------------------------------------------
                  */
+                ctx->indent_level++;
                 if (next) {
+                    ctx->need_prefix = TRUE;
+                    h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
                     h5tools_str_reset(&buffer);
                     h5tools_str_append(&buffer, "%s", CONTIGUOUS);
                     h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
@@ -3061,6 +3160,9 @@ h5tools_dump_dcpl(FILE *stream, const h5tool_format_t *info,
                 else {
                     haddr_t ioffset;
 
+                    ctx->need_prefix = TRUE;
+                    h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
                     h5tools_str_reset(&buffer);
                     h5tools_str_append(&buffer, "%s", CONTIGUOUS);
                     h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
@@ -3080,8 +3182,116 @@ h5tools_dump_dcpl(FILE *stream, const h5tool_format_t *info,
                     h5tools_str_append(&buffer, "OFFSET "H5_PRINTF_HADDR_FMT, ioffset);
                     h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
                 }
+                ctx->indent_level--;
             }
             break;
+
+        case H5D_VIRTUAL:
+            {
+                char dsetname[256];     /* virtual datset name       */
+                size_t vmaps;
+
+                H5Pget_virtual_count(dcpl_id, &vmaps);
+
+                if (vmaps) {
+                    size_t next;
+                    ssize_t ssize_out;
+
+                    ctx->indent_level++;
+                    for (next = 0; next < (unsigned) vmaps; next++) {
+                        hid_t virtual_vspace = H5Pget_virtual_vspace(dcpl_id, next);
+                        hid_t virtual_srcspace = H5Pget_virtual_srcspace(dcpl_id, next);
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s %ld %s ", VDS_MAPPING, next, BEGIN);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                        ctx->indent_level++;
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s %s", VDS_VIRTUAL, BEGIN);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                        ctx->indent_level++;
+
+                        h5tools_print_virtual_selection(virtual_vspace, stream, info, ctx, &buffer, &curr_pos, (size_t) ncols);
+
+                        ctx->indent_level--;
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s", END);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s %s", VDS_SOURCE, BEGIN);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                        ctx->indent_level++;
+
+                        ssize_out = H5Pget_virtual_filename(dcpl_id, next, NULL, 0);
+                        HDassert(ssize_out > 0);
+                        HDassert((size_t)ssize_out < sizeof(name));
+                        H5Pget_virtual_filename(dcpl_id, next, name, sizeof(name));
+                        ssize_out = H5Pget_virtual_dsetname(dcpl_id, next, NULL, 0);
+                        HDassert(ssize_out > 0);
+                        HDassert((size_t)ssize_out < sizeof(name));
+                        H5Pget_virtual_dsetname(dcpl_id, next, dsetname, sizeof(dsetname));
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s %s", VDS_SRC_FILE, h5tools_dump_header_format->virtualfilenamebegin);
+                        h5tools_str_append(&buffer, "%s", name);
+                        h5tools_str_append(&buffer, "%s", h5tools_dump_header_format->virtualfilenameend);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s %s", VDS_SRC_DATASET, h5tools_dump_header_format->virtualdatasetnamebegin);
+                        h5tools_str_append(&buffer, "%s", dsetname);
+                        h5tools_str_append(&buffer, "%s", h5tools_dump_header_format->virtualdatasetnameend);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                        h5tools_print_virtual_selection(virtual_srcspace, stream, info, ctx, &buffer, &curr_pos, (size_t) ncols);
+
+                        ctx->indent_level--;
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s", END);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+
+                        ctx->indent_level--;
+
+                        ctx->need_prefix = TRUE;
+                        h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
+
+                        h5tools_str_reset(&buffer);
+                        h5tools_str_append(&buffer, "%s", END);
+                        h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
+                    }
+                    ctx->indent_level--;
+                }
+            }
+            break;
+
         case H5D_LAYOUT_ERROR:
         case H5D_NLAYOUTS:
         default:
@@ -3090,8 +3300,6 @@ h5tools_dump_dcpl(FILE *stream, const h5tool_format_t *info,
             h5tools_render_element(stream, info, ctx, &buffer, &curr_pos, (size_t) ncols, (hsize_t) 0, (hsize_t) 0);
     }/*switch*/
 
-    ctx->indent_level--;
-
     ctx->need_prefix = TRUE;
     h5tools_simple_prefix(stream, info, ctx, curr_pos, 0);
 
diff --git a/tools/lib/h5tools_str.c b/tools/lib/h5tools_str.c
index 9d151d0..bdb82a4 100644
--- a/tools/lib/h5tools_str.c
+++ b/tools/lib/h5tools_str.c
@@ -413,9 +413,9 @@ h5tools_str_region_prefix(h5tools_str_t *str, const h5tool_format_t *info,
 }
 
 /*-------------------------------------------------------------------------
- * Function:    h5tools_str_dump_region_blocks
+ * Function:    h5tools_str_dump_space_slabs
  *
- * Purpose: Prints information about a dataspace region by appending
+ * Purpose: Prints information about a dataspace selection by appending
  *          the information to the specified string.
  *
  * Return:  none
@@ -426,19 +426,85 @@ h5tools_str_region_prefix(h5tools_str_t *str, const h5tool_format_t *info,
  *-------------------------------------------------------------------------
  */
 void
-h5tools_str_dump_region_blocks(h5tools_str_t *str, hid_t region,
+h5tools_str_dump_space_slabs(h5tools_str_t *str, hid_t rspace,
+        const h5tool_format_t *info, h5tools_context_t *ctx)
+{
+    hsize_t   start[H5S_MAX_RANK];
+    hsize_t   stride[H5S_MAX_RANK];
+    hsize_t   count[H5S_MAX_RANK];
+    hsize_t   block[H5S_MAX_RANK];
+    int       j;
+    int       ndims = H5Sget_simple_extent_ndims(rspace);
+
+    H5Sget_regular_hyperslab(rspace, start, stride, count, block);
+
+    /* Print hyperslab information */
+
+    /* Start coordinates */
+    h5tools_str_append(str, "%s%s ", info->line_indent, START);
+    for (j = 0; j < ndims; j++)
+        h5tools_str_append(str, "%s" HSIZE_T_FORMAT, j ? "," : "(", start[j]);
+    h5tools_str_append(str, ")");
+    h5tools_str_append(str, "%s", "\n");
+    h5tools_str_indent(str, info, ctx);
+
+    /* Stride coordinates */
+    h5tools_str_append(str, "%s ", STRIDE);
+    for (j = 0; j < ndims; j++)
+        h5tools_str_append(str, "%s" HSIZE_T_FORMAT, j ? "," : "(", stride[j]);
+    h5tools_str_append(str, ")");
+    h5tools_str_append(str, "%s", "\n");
+    h5tools_str_indent(str, info, ctx);
+
+    /* Count coordinates */
+    h5tools_str_append(str, "%s ", COUNT);
+    for (j = 0; j < ndims; j++) {
+        if(count[j] == H5S_UNLIMITED)
+            h5tools_str_append(str, "%s%s", j ? "," : "(","H5S_UNLIMITED");
+        else
+            h5tools_str_append(str, "%s" HSIZE_T_FORMAT, j ? "," : "(", count[j]);
+    }
+    h5tools_str_append(str, ")");
+    h5tools_str_append(str, "%s", "\n");
+    h5tools_str_indent(str, info, ctx);
+
+    /* Block coordinates */
+    h5tools_str_append(str, "%s ", BLOCK);
+    for (j = 0; j < ndims; j++) {
+        if(block[j] == H5S_UNLIMITED)
+            h5tools_str_append(str, "%s%s", j ? "," : "(","H5S_UNLIMITED");
+        else
+            h5tools_str_append(str, "%s" HSIZE_T_FORMAT, j ? "," : "(", block[j]);
+    }
+    h5tools_str_append(str, ")");
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    h5tools_str_dump_space_blocks
+ *
+ * Purpose: Prints information about a dataspace selection by appending
+ *          the information to the specified string.
+ *
+ * Return:  none
+ *
+ * In/Out:
+ *      h5tools_str_t     *str
+ *-------------------------------------------------------------------------
+ */
+void
+h5tools_str_dump_space_blocks(h5tools_str_t *str, hid_t rspace,
         const h5tool_format_t *info)
 {
     hssize_t   nblocks;
     hsize_t    alloc_size;
     hsize_t   *ptdata;
-    int        ndims = H5Sget_simple_extent_ndims(region);
+    int        ndims = H5Sget_simple_extent_ndims(rspace);
 
     /*
-     * This function fails if the region does not have blocks.
+     * This function fails if the rspace does not have blocks.
      */
     H5E_BEGIN_TRY {
-        nblocks = H5Sget_select_hyper_nblocks(region);
+        nblocks = H5Sget_select_hyper_nblocks(rspace);
     } H5E_END_TRY;
 
     /* Print block information */
@@ -449,7 +515,7 @@ h5tools_str_dump_region_blocks(h5tools_str_t *str, hid_t region,
         HDassert(alloc_size == (hsize_t) ((size_t) alloc_size)); /*check for overflow*/
         ptdata = (hsize_t *)HDmalloc((size_t) alloc_size);
         H5_CHECK_OVERFLOW(nblocks, hssize_t, hsize_t);
-        H5Sget_select_hyper_blocklist(region, (hsize_t)0, (hsize_t)nblocks, ptdata);
+        H5Sget_select_hyper_blocklist(rspace, (hsize_t)0, (hsize_t)nblocks, ptdata);
 
         for (i = 0; i < nblocks; i++) {
             int j;
@@ -473,32 +539,31 @@ h5tools_str_dump_region_blocks(h5tools_str_t *str, hid_t region,
 }
 
 /*-------------------------------------------------------------------------
- * Function:    h5tools_str_dump_region_points
+ * Function:    h5tools_str_dump_space_points
  *
- * Purpose: Prints information about a dataspace region by appending
+ * Purpose: Prints information about a dataspace selection by appending
  *          the information to the specified string.
  *
  * Return:  none
  *
  * In/Out:
- *      h5tools_context_t *ctx
  *      h5tools_str_t     *str
  *-------------------------------------------------------------------------
  */
 void
-h5tools_str_dump_region_points(h5tools_str_t *str, hid_t region,
+h5tools_str_dump_space_points(h5tools_str_t *str, hid_t rspace,
         const h5tool_format_t *info)
 {
     hssize_t   npoints;
     hsize_t    alloc_size;
     hsize_t   *ptdata;
-    int        ndims = H5Sget_simple_extent_ndims(region);
+    int        ndims = H5Sget_simple_extent_ndims(rspace);
 
     /*
-     * This function fails if the region does not have points.
+     * This function fails if the rspace does not have points.
      */
     H5E_BEGIN_TRY {
-        npoints = H5Sget_select_elem_npoints(region);
+        npoints = H5Sget_select_elem_npoints(rspace);
     } H5E_END_TRY;
 
     /* Print point information */
@@ -509,7 +574,7 @@ h5tools_str_dump_region_points(h5tools_str_t *str, hid_t region,
         HDassert(alloc_size == (hsize_t) ((size_t) alloc_size)); /*check for overflow*/
         ptdata = (hsize_t *)HDmalloc((size_t) alloc_size);
         H5_CHECK_OVERFLOW(npoints, hssize_t, hsize_t);
-        H5Sget_select_elem_pointlist(region, (hsize_t)0, (hsize_t)npoints, ptdata);
+        H5Sget_select_elem_pointlist(rspace, (hsize_t)0, (hsize_t)npoints, ptdata);
 
         for (i = 0; i < npoints; i++) {
             int j;
@@ -1243,9 +1308,9 @@ h5tools_str_sprint_region(h5tools_str_t *str, const h5tool_format_t *info,
 
             region_type = H5Sget_select_type(region);
             if(region_type==H5S_SEL_POINTS)
-                h5tools_str_dump_region_points(str, region, info);
+                h5tools_str_dump_space_points(str, region, info);
             else
-                h5tools_str_dump_region_blocks(str, region, info);
+                h5tools_str_dump_space_blocks(str, region, info);
 
             h5tools_str_append(str, "}");
 
diff --git a/tools/lib/h5tools_str.h b/tools/lib/h5tools_str.h
index 38697c6..6173b89 100644
--- a/tools/lib/h5tools_str.h
+++ b/tools/lib/h5tools_str.h
@@ -40,8 +40,9 @@ H5TOOLS_DLL char    *h5tools_str_prefix(h5tools_str_t *str, const h5tool_format_
 H5TOOLS_DLL char    *h5tools_str_region_prefix(h5tools_str_t *str, const h5tool_format_t *info,
                                    hsize_t elmtno, hsize_t *ptdata, unsigned ndims, 
                                    hsize_t max_idx[], h5tools_context_t *ctx);
-H5TOOLS_DLL void     h5tools_str_dump_region_blocks(h5tools_str_t *, hid_t, const h5tool_format_t *);
-H5TOOLS_DLL void     h5tools_str_dump_region_points(h5tools_str_t *, hid_t, const h5tool_format_t *);
+H5TOOLS_DLL void     h5tools_str_dump_space_slabs(h5tools_str_t *, hid_t, const h5tool_format_t *, h5tools_context_t *ctx);
+H5TOOLS_DLL void     h5tools_str_dump_space_blocks(h5tools_str_t *, hid_t, const h5tool_format_t *);
+H5TOOLS_DLL void     h5tools_str_dump_space_points(h5tools_str_t *, hid_t, const h5tool_format_t *);
 H5TOOLS_DLL void     h5tools_str_sprint_region(h5tools_str_t *str, const h5tool_format_t *info, hid_t container,
                                    void *vp);
 H5TOOLS_DLL char    *h5tools_str_sprint(h5tools_str_t *str, const h5tool_format_t *info,
diff --git a/tools/misc/CMakeLists.txt b/tools/misc/CMakeLists.txt
index d53cdc8..088dbdf 100644
--- a/tools/misc/CMakeLists.txt
+++ b/tools/misc/CMakeLists.txt
@@ -52,6 +52,9 @@ if (BUILD_TESTING)
     target_link_libraries (h5repart_gentest ${HDF5_LIB_TARGET} ${HDF5_TOOLS_LIB_TARGET})
     set_target_properties (h5repart_gentest PROPERTIES FOLDER generator/tools)
     #add_test (NAME h5repart_gentest COMMAND $<TARGET_FILE:h5repart_gentest>)
+
+    add_subdirectory (${HDF5_TOOLS_MISC_SOURCE_DIR}/vds)
+
   endif (HDF5_BUILD_GENERATORS)
 
   add_executable (h5repart_test ${HDF5_TOOLS_MISC_SOURCE_DIR}/repart_test.c)
diff --git a/tools/misc/Makefile.am b/tools/misc/Makefile.am
index 53b1872..fdfe8f7 100644
--- a/tools/misc/Makefile.am
+++ b/tools/misc/Makefile.am
@@ -20,6 +20,8 @@
 
 include $(top_srcdir)/config/commence.am
 
+SUBDIRS=vds
+
 # Include src directory
 AM_CPPFLAGS+=-I$(top_srcdir)/src -I$(top_srcdir)/tools/lib
 
diff --git a/tools/misc/vds/CMakeLists.txt b/tools/misc/vds/CMakeLists.txt
new file mode 100644
index 0000000..dcf883c
--- /dev/null
+++ b/tools/misc/vds/CMakeLists.txt
@@ -0,0 +1,28 @@
+cmake_minimum_required (VERSION 3.1.0)
+PROJECT (HDF5_TOOLS_MISC_VDS)
+
+#-----------------------------------------------------------------------------
+# Setup include Directories
+#-----------------------------------------------------------------------------
+INCLUDE_DIRECTORIES (${HDF5_TOOLS_SRC_DIR}/lib)
+
+MACRO (ADD_H5_GENERATOR genfile)
+  add_executable (${genfile} ${HDF5_TOOLS_MISC_VDS_SOURCE_DIR}/${genfile}.c)
+  TARGET_NAMING (${genfile} STATIC)
+  TARGET_C_PROPERTIES (${genfile} STATIC " " " ")
+  target_link_libraries (${genfile} ${HDF5_LIB_TARGET} ${HDF5_TOOLS_LIB_TARGET})
+  set_target_properties (${genfile} PROPERTIES FOLDER generator/tools)
+ENDMACRO (ADD_H5_GENERATOR genfile)
+
+# generator executables
+set (H5_GENERATORS
+    UC_1_one_dim_gen
+    UC_2_two_dims_gen
+    UC_3_gaps_gen
+    UC_4_printf_gen
+    UC_5_stride_gen
+)
+
+foreach (gen ${H5_GENERATORS})
+  ADD_H5_GENERATOR (${gen})
+endforeach (gen ${H5_GENERATORS})
diff --git a/tools/misc/vds/Makefile.am b/tools/misc/vds/Makefile.am
new file mode 100644
index 0000000..f1ef80c
--- /dev/null
+++ b/tools/misc/vds/Makefile.am
@@ -0,0 +1,38 @@
+#
+# Copyright by The HDF Group.
+# Copyright by the Board of Trustees of the University of Illinois.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the files COPYING and Copyright.html.  COPYING can be found at the root
+# of the source code distribution tree; Copyright.html can be found at the
+# root level of an installed copy of the electronic HDF5 document set and
+# is linked from the top-level documents page.  It can also be found at
+# http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have
+# access to either file, you may request a copy from help@hdfgroup.org.
+##
+## Makefile.am
+## Run automake to generate a Makefile.in from this file.
+#
+# HDF5 Library Makefile(.in)
+#
+
+include $(top_srcdir)/config/commence.am
+
+# Include src directory
+AM_CPPFLAGS+=-I$(top_srcdir)/src -I$(top_srcdir)/tools/lib
+
+#test scripts and programs
+TEST_PROG=UC_1_one_dim_gen UC_2_two_dims_gen UC_3_gaps_gen UC_4_printf_gen \
+    UC_5_stride_gen
+
+check_PROGRAMS=$(TEST_PROG)
+
+# Temporary files.
+CHECK_CLEANFILES+=*.h5
+
+# All programs rely on hdf5 library and h5tools library
+LDADD=$(LIBH5TOOLS) $(LIBHDF5)
+
+include $(top_srcdir)/config/conclude.am
diff --git a/tools/misc/vds/UC_1.h b/tools/misc/vds/UC_1.h
new file mode 100644
index 0000000..29df72b
--- /dev/null
+++ b/tools/misc/vds/UC_1.h
@@ -0,0 +1,150 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef UC_1_H
+#define UC_1_H
+
+#include "hdf5.h"
+
+#include "UC_common.h"
+
+/*
+ * Definitions for VDS use case 1
+ *
+ * Datasets have a single unlimited dimension and two fixed dimensions. They
+ * are mapped along a single dimension in the VDS with no gaps between them.
+ */
+
+/* virtual dataset <---> source dataset mapping and sizes
+
+   *****************  --+
+   *       A       *    K
+   *****************  --+
+   *               *    |
+   *       B       *    N
+   *               *    |
+   *****************  --+
+   *       C       *
+   *****************
+   *               *
+   *       D       *
+   *               *
+   *****************
+   *       E       *
+   *****************
+   *               *
+   *       F       *
+   *               *
+   *****************
+
+   |               |
+   +-------M-------+
+ 
+
+        dim[0]
+       /
+      /
+     /
+    -----> dim[2]
+    |
+    |
+    |
+   dim[1]
+
+  */
+
+
+#define UC_1_N_SOURCES      6
+
+/* Dataset dimensions */
+#define UC_1_SM_HEIGHT      2   /* K */
+#define UC_1_LG_HEIGHT      4   /* N */
+#define UC_1_SM_LG_HEIGHT   6   /* SM_HEIGHT + LG_HEIGHT */
+#define UC_1_FULL_HEIGHT    18  /* (3 * K) + (3 * N) */
+#define UC_1_HALF_HEIGHT    9
+#define UC_1_WIDTH          8   /* M */
+#define UC_1_HALF_WIDTH     4
+
+#define UC_1_N_MAX_PLANES   H5S_UNLIMITED   /* max number of planes         */
+#define UC_1_N_TEST_PLANES  5               /* number of planes we write    */
+
+/* Dataset datatypes */
+#define UC_1_SOURCE_DATATYPE    H5T_STD_I32LE
+#define UC_1_VDS_DATATYPE       H5T_STD_I32LE
+
+/* Starting size of datasets, both source and VDS */
+static hsize_t UC_1_DIMS[UC_1_N_SOURCES][RANK] = {
+    {0, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {0, UC_1_LG_HEIGHT, UC_1_WIDTH},
+    {0, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {0, UC_1_LG_HEIGHT, UC_1_WIDTH},
+    {0, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {0, UC_1_LG_HEIGHT, UC_1_WIDTH}
+};
+static hsize_t UC_1_VDS_DIMS[RANK] = {0, UC_1_FULL_HEIGHT, UC_1_WIDTH};
+
+/* Maximum size of datasets, both source and VDS */
+static hsize_t UC_1_MAX_DIMS[UC_1_N_SOURCES][RANK] = {
+    {UC_1_N_MAX_PLANES, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {UC_1_N_MAX_PLANES, UC_1_LG_HEIGHT, UC_1_WIDTH},
+    {UC_1_N_MAX_PLANES, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {UC_1_N_MAX_PLANES, UC_1_LG_HEIGHT, UC_1_WIDTH},
+    {UC_1_N_MAX_PLANES, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {UC_1_N_MAX_PLANES, UC_1_LG_HEIGHT, UC_1_WIDTH}
+};
+static hsize_t UC_1_VDS_MAX_DIMS[RANK] = {UC_1_N_MAX_PLANES, UC_1_FULL_HEIGHT, UC_1_WIDTH};
+
+/* Planes */
+static hsize_t UC_1_PLANES[UC_1_N_SOURCES][RANK] = {
+    {1, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {1, UC_1_LG_HEIGHT, UC_1_WIDTH},
+    {1, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {1, UC_1_LG_HEIGHT, UC_1_WIDTH},
+    {1, UC_1_SM_HEIGHT, UC_1_WIDTH},
+    {1, UC_1_LG_HEIGHT, UC_1_WIDTH}
+};
+static hsize_t UC_1_VDS_PLANE[RANK] = {1, UC_1_FULL_HEIGHT, UC_1_WIDTH};
+
+/* File names for source datasets */
+static char UC_1_FILE_NAMES[UC_1_N_SOURCES][NAME_LEN] = {
+    {"1_a.h5"},
+    {"1_b.h5"},
+    {"1_c.h5"},
+    {"1_d.h5"},
+    {"1_e.h5"},
+    {"1_f.h5"}
+};
+
+/* VDS file name */
+static char UC_1_VDS_FILE_NAME[NAME_LEN] = "1_vds.h5";
+    
+/* Dataset names */
+static char UC_1_SOURCE_DSET_NAME[NAME_LEN] = "source_dset";
+static char UC_1_SOURCE_DSET_PATH[NAME_LEN] = "/source_dset";
+static char UC_1_VDS_DSET_NAME[NAME_LEN]    = "vds_dset";
+
+/* Fill values */
+static hsize_t UC_1_FILL_VALUES[UC_1_N_SOURCES] = {
+    -1,
+    -2,
+    -3,
+    -4,
+    -5,
+    -6
+};
+static int UC_1_VDS_FILL_VALUE = -9;
+
+#endif /* UC_1_H */
+
diff --git a/tools/misc/vds/UC_1_one_dim_gen.c b/tools/misc/vds/UC_1_one_dim_gen.c
new file mode 100644
index 0000000..a78268b
--- /dev/null
+++ b/tools/misc/vds/UC_1_one_dim_gen.c
@@ -0,0 +1,239 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * File/dataset generator for VDS use case 1
+ *
+ * See the header file for a description.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "hdf5.h"
+
+#include "UC_common.h"
+#include "UC_1.h"
+
+
+int
+main(int argc, char *argv[])
+{
+    hid_t src_sid       = -1;   /* source dataset's dataspace ID            */
+    hid_t src_dcplid    = -1;   /* source dataset property list ID          */
+
+    hid_t vds_sid       = -1;   /* VDS dataspace ID                         */
+    hid_t vds_dcplid    = -1;   /* VDS dataset property list ID             */
+
+    hid_t fid           = -1;   /* HDF5 file ID                             */
+    hid_t did           = -1;   /* dataset ID                               */
+    hid_t msid          = -1;   /* memory dataspace ID                      */
+    hid_t fsid          = -1;   /* file dataspace ID                        */
+
+    hsize_t extent[RANK];       /* dataset extents                          */
+    hsize_t start[RANK];        /* starting point for hyperslab             */
+    int map_start       = -1;   /* starting point in the VDS map            */
+
+    int *buffer         = NULL; /* data buffer                              */
+    hsize_t count       = 0;    /* number of elements in a plane            */
+    int n_planes        = -1;   /* number of planes to write                */
+    int value           = -1;   /* value written to datasets                */
+
+    int i;                      /* iterator                                 */
+    int j;                      /* iterator                                 */
+    int k;                      /* iterator                                 */
+
+
+    /* Start by creating the virtual dataset (VDS) dataspace and creation
+     * property list. The individual source datasets are then created
+     * and the VDS map (stored in the VDS property list) is updated.
+     */
+
+    /* Create VDS dcpl */
+    if((vds_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        UC_ERROR
+    if(H5Pset_fill_value(vds_dcplid, UC_1_VDS_DATATYPE,
+                &UC_1_VDS_FILL_VALUE) < 0)
+        UC_ERROR
+
+    /* Create VDS dataspace */
+    if((vds_sid = H5Screate_simple(RANK, UC_1_VDS_DIMS,
+                    UC_1_VDS_MAX_DIMS)) < 0)
+        UC_ERROR
+
+    /************************************
+     * Create source files and datasets *
+     ************************************/
+
+    start[0] = 0;
+    start[1] = 0;
+    start[2] = 0;
+    map_start = 0;
+
+    for(i = 0; i < UC_1_N_SOURCES; i++) {
+
+        /* Create source dataset dcpl */
+        if((src_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+            UC_ERROR
+        if(H5Pset_chunk(src_dcplid, RANK, UC_1_PLANES[i]) < 0)
+            UC_ERROR
+        if(H5Pset_fill_value(src_dcplid, UC_1_SOURCE_DATATYPE,
+                    &UC_1_FILL_VALUES[i]) < 0)
+            UC_ERROR
+        if(0 != i % 2)
+            if(H5Pset_deflate(src_dcplid, COMPRESSION_LEVEL) < 0)
+                UC_ERROR
+
+        /* Create source file, dataspace, and dataset */
+        if((fid = H5Fcreate(UC_1_FILE_NAMES[i], H5F_ACC_TRUNC,
+                        H5P_DEFAULT, H5P_DEFAULT)) < 0)
+            UC_ERROR
+        if((src_sid = H5Screate_simple(RANK, UC_1_DIMS[i],
+                        UC_1_MAX_DIMS[i])) < 0)
+            UC_ERROR
+        if((did = H5Dcreate2(fid, UC_1_SOURCE_DSET_NAME,
+                        UC_1_SOURCE_DATATYPE, src_sid,
+                        H5P_DEFAULT, src_dcplid, H5P_DEFAULT)) < 0)
+            UC_ERROR
+
+        /* Set the dataset's extent (will eventually vary with i) */
+        extent[0] = UC_1_N_TEST_PLANES;
+        extent[1] = UC_1_PLANES[i][1];
+        extent[2] = UC_1_PLANES[i][2];
+        if(H5Dset_extent(did, extent) < 0)
+            UC_ERROR
+
+        /* Create a data buffer that represents a plane */
+        count = UC_1_PLANES[i][1] * UC_1_PLANES[i][2];
+        if(NULL == (buffer = (int *)malloc(count * sizeof(int))))
+            UC_ERROR
+
+        /* Create the memory dataspace */
+        if((msid = H5Screate_simple(RANK, UC_1_PLANES[i], NULL)) < 0)
+            UC_ERROR
+
+        /* Get the file dataspace */
+        if((fsid = H5Dget_space(did)) < 0)
+            UC_ERROR
+
+        /* Write planes to the dataset, number will eventually vary with i */
+        n_planes = UC_1_N_TEST_PLANES;
+        for(j = 0; j < n_planes; j++) {
+
+            value = ((i + 1) * 10) + j;
+            for(k = 0; k < count; k++)
+               buffer[k] = value; 
+
+            start[0] = j;
+            start[1] = 0;
+            start[2] = 0;
+            if(H5Sselect_hyperslab(fsid, H5S_SELECT_SET, start, NULL, UC_1_PLANES[i], NULL) < 0)
+                UC_ERROR
+            if(H5Dwrite(did, H5T_NATIVE_INT, msid, fsid, H5P_DEFAULT, buffer) < 0)
+                UC_ERROR
+
+        } /* end for */
+
+        /* set up hyperslabs for source and destination datasets */
+        start[0] = 0;
+        start[1] = 0;
+        start[2] = 0;
+        if(H5Sselect_hyperslab(src_sid, H5S_SELECT_SET, start, NULL,
+                    UC_1_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+        start[0] = 0;
+        start[1] = map_start;
+        start[2] = 0;
+        if(H5Sselect_hyperslab(vds_sid, H5S_SELECT_SET, start, NULL,
+                    UC_1_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+        map_start += UC_1_PLANES[i][1];
+
+        /* Add VDS mapping */
+        if(H5Pset_virtual(vds_dcplid, vds_sid, UC_1_FILE_NAMES[i],
+                    UC_1_SOURCE_DSET_PATH, src_sid) < 0)
+            UC_ERROR
+
+        /* close */
+        if(H5Sclose(src_sid) < 0)
+            UC_ERROR
+        if(H5Pclose(src_dcplid) < 0)
+            UC_ERROR
+        if(H5Sclose(msid) < 0)
+            UC_ERROR
+        if(H5Sclose(fsid) < 0)
+            UC_ERROR
+        if(H5Dclose(did) < 0)
+            UC_ERROR
+        if(H5Fclose(fid) < 0)
+            UC_ERROR
+        free(buffer);
+
+    } /* end for */
+
+
+    /*******************
+     * Create VDS file *
+     *******************/
+
+    /* file */
+    if((fid = H5Fcreate(UC_1_VDS_FILE_NAME, H5F_ACC_TRUNC,
+                    H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* dataset */
+    if((did = H5Dcreate2(fid, UC_1_VDS_DSET_NAME, UC_1_VDS_DATATYPE, vds_sid,
+                    H5P_DEFAULT, vds_dcplid, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* close */
+    if(H5Pclose(vds_dcplid) < 0)
+        UC_ERROR
+    if(H5Sclose(vds_sid) < 0)
+        UC_ERROR
+    if(H5Dclose(did) < 0)
+        UC_ERROR
+    if(H5Fclose(fid) < 0)
+        UC_ERROR
+
+    return EXIT_SUCCESS;
+
+error:
+
+    H5E_BEGIN_TRY {
+        if(src_sid >= 0)
+            (void)H5Sclose(src_sid);
+        if(src_dcplid >= 0)
+            (void)H5Pclose(src_dcplid);
+        if(vds_sid >= 0)
+            (void)H5Sclose(vds_sid);
+        if(vds_dcplid >= 0)
+            (void)H5Pclose(vds_dcplid);
+        if(fid >= 0)
+            (void)H5Fclose(fid);
+        if(did >= 0)
+            (void)H5Dclose(did);
+        if(msid >= 0)
+            (void)H5Sclose(msid);
+        if(fsid >= 0)
+            (void)H5Sclose(fsid);
+        if(buffer != NULL)
+            free(buffer);
+    } H5E_END_TRY
+
+    return EXIT_FAILURE;
+
+} /* end main */
+
diff --git a/tools/misc/vds/UC_2.h b/tools/misc/vds/UC_2.h
new file mode 100644
index 0000000..3e4e4fd
--- /dev/null
+++ b/tools/misc/vds/UC_2.h
@@ -0,0 +1,151 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef UC_2_H
+#define UC_2_H
+
+#include "hdf5.h"
+
+/*
+ * Definitions for VDS use case 2
+ *
+ * Datasets have a single unlimited dimension and two fixed dimensions. They
+ * are mapped along two dimensions in the VDS with no gaps between them.
+ */
+
+/* virtual dataset <---> source dataset mapping and sizes
+
+   **********************************
+   *       A       *                *
+   *****************        D       *
+   *               *                *
+   *       B       *                *
+   *               ******************
+   *****************        E       *
+   *       C       *                *
+   **********************************
+
+
+        dim[0]
+       /
+      /
+     /
+    -----> dim[2]
+    |
+    |
+    |
+   dim[1]
+ 
+ */
+
+#define UC_2_N_SOURCES      5
+
+/* Dataset dimensions */
+#define UC_2_A_HEIGHT       2
+#define UC_2_B_HEIGHT       4
+#define UC_2_AB_HEIGHT      6   /* For hyperslab start position */
+#define UC_2_C_HEIGHT       2
+#define UC_2_D_HEIGHT       5
+#define UC_2_E_HEIGHT       3
+#define UC_2_FULL_HEIGHT    8  /* A+B+C and D+E */
+#define UC_2_WIDTH          7
+#define UC_2_FULL_WIDTH     14 /* 2*width */
+
+#define UC_2_N_PLANES_IN_SERIES 3   /* number of planes in a series of sub-images */
+#define UC_2_N_MAX_PLANES       H5S_UNLIMITED   /* max number of planes */
+#define UC_2_N_TEST_PLANES      6   /* number of planes we write */
+
+/* Dataset datatypes */
+#define UC_2_SOURCE_DATATYPE    H5T_STD_I32LE
+#define UC_2_VDS_DATATYPE       H5T_STD_I32LE
+
+/* Starting size of datasets, both source and VDS */
+static hsize_t UC_2_DIMS[UC_2_N_SOURCES][RANK] = {
+    {0, UC_2_A_HEIGHT, UC_2_WIDTH},
+    {0, UC_2_B_HEIGHT, UC_2_WIDTH},
+    {0, UC_2_C_HEIGHT, UC_2_WIDTH},
+    {0, UC_2_D_HEIGHT, UC_2_WIDTH},
+    {0, UC_2_E_HEIGHT, UC_2_WIDTH}
+};
+static hsize_t UC_2_VDS_DIMS[RANK]  = {0, UC_2_FULL_HEIGHT, UC_2_FULL_WIDTH};
+
+/* Maximum size of datasets, both source and VDS */
+static hsize_t UC_2_MAX_DIMS[UC_2_N_SOURCES][RANK] = {
+    {UC_2_N_MAX_PLANES, UC_2_A_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_MAX_PLANES, UC_2_B_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_MAX_PLANES, UC_2_C_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_MAX_PLANES, UC_2_D_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_MAX_PLANES, UC_2_E_HEIGHT, UC_2_WIDTH}
+};
+static hsize_t UC_2_VDS_MAX_DIMS[RANK]  = {UC_2_N_MAX_PLANES, UC_2_FULL_HEIGHT, UC_2_FULL_WIDTH};
+
+/* Positions of source datasets in the VDS */
+static hsize_t UC_2_POSITIONS[UC_2_N_SOURCES][RANK] = {
+    /* A */ {0, 0,              0},
+    /* B */ {0, UC_2_A_HEIGHT,  0},
+    /* C */ {0, UC_2_AB_HEIGHT, 0},
+    /* D */ {0, 0,              UC_2_WIDTH},
+    /* E */ {0, UC_2_D_HEIGHT,  UC_2_WIDTH}
+};
+
+/* Planes */
+static hsize_t UC_2_PLANES[UC_2_N_SOURCES][RANK] = {
+    {1, UC_2_A_HEIGHT, UC_2_WIDTH},
+    {1, UC_2_B_HEIGHT, UC_2_WIDTH},
+    {1, UC_2_C_HEIGHT, UC_2_WIDTH},
+    {1, UC_2_D_HEIGHT, UC_2_WIDTH},
+    {1, UC_2_E_HEIGHT, UC_2_WIDTH}
+};
+static hsize_t UC_2_VDS_SUB_IMAGE[RANK] = {1, UC_2_FULL_HEIGHT, UC_2_WIDTH};
+static hsize_t UC_2_VDS_PLANE[RANK]     = {1, UC_2_FULL_HEIGHT, UC_2_FULL_WIDTH};
+
+/* Chunk dimensions */
+static hsize_t UC_2_CHUNK_DIMS[UC_2_N_SOURCES][RANK] = {
+    {UC_2_N_PLANES_IN_SERIES, UC_2_A_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_PLANES_IN_SERIES, UC_2_B_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_PLANES_IN_SERIES, UC_2_C_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_PLANES_IN_SERIES, UC_2_D_HEIGHT, UC_2_WIDTH},
+    {UC_2_N_PLANES_IN_SERIES, UC_2_E_HEIGHT, UC_2_WIDTH}
+};
+
+/* File names for source datasets */
+static char UC_2_FILE_NAMES[UC_2_N_SOURCES][NAME_LEN] = {
+    {"2_a.h5"},
+    {"2_b.h5"},
+    {"2_c.h5"},
+    {"2_d.h5"},
+    {"2_e.h5"}
+};
+
+/* VDS file name */
+#define UC_2_VDS_FILE_NAME    "2_vds.h5"
+    
+/* Dataset names */
+#define UC_2_SOURCE_DSET_NAME   "source_dset"
+#define UC_2_SOURCE_DSET_PATH   "/source_dset"
+#define UC_2_VDS_DSET_NAME      "vds_dset"
+
+/* Fill values */
+static hsize_t UC_2_FILL_VALUES[UC_2_N_SOURCES] = {
+    -1,
+    -2,
+    -3,
+    -4,
+    -5
+};
+static int UC_2_VDS_FILL_VALUE      = -9;
+
+#endif /* UC_2_H */
+
diff --git a/tools/misc/vds/UC_2_two_dims_gen.c b/tools/misc/vds/UC_2_two_dims_gen.c
new file mode 100644
index 0000000..b5fd319
--- /dev/null
+++ b/tools/misc/vds/UC_2_two_dims_gen.c
@@ -0,0 +1,230 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * File/dataset generator for VDS use case 2
+ *
+ * See the header file for a description.
+ */
+
+
+#include <stdlib.h>
+
+#include "hdf5.h"
+
+#include "UC_common.h"
+#include "UC_2.h"
+
+int
+main(int argc, char *argv[])
+{
+    hid_t src_sid       = -1;   /* source dataset's dataspace ID            */
+    hid_t src_dcplid    = -1;   /* source dataset property list ID          */
+
+    hid_t vds_sid       = -1;   /* VDS dataspace ID                         */
+    hid_t vds_dcplid    = -1;   /* VDS dataset property list ID             */
+
+    hid_t fid           = -1;   /* HDF5 file ID                             */
+    hid_t did           = -1;   /* dataset ID                               */
+    hid_t msid          = -1;   /* memory dataspace ID                      */
+    hid_t fsid          = -1;   /* file dataspace ID                        */
+
+    hsize_t start[RANK];        /* starting point for hyperslab             */
+    hsize_t extent[RANK];       /* dataset extents                          */
+
+    int *buffer         = NULL; /* data buffer                              */
+    int value           = -1;   /* value written to datasets                */
+    hsize_t count       = 0;    /* number of elements in a plane            */
+    int n_planes        = -1;   /* number of planes to write                */
+
+    int i;                      /* iterator                                 */
+    int j;                      /* iterator                                 */
+    int k;                      /* iterator                                 */
+
+
+    /* Start by creating the virtual dataset (VDS) dataspace and creation
+     * property list. The individual source datasets are then created
+     * and the VDS map (stored in the VDS property list) is updated.
+     */
+
+    /* Create VDS dcpl */
+    if((vds_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        UC_ERROR
+    if(H5Pset_fill_value(vds_dcplid, UC_2_VDS_DATATYPE,
+                &UC_2_VDS_FILL_VALUE) < 0)
+        UC_ERROR
+
+    /* Create VDS dataspace */
+    if((vds_sid = H5Screate_simple(RANK, UC_2_VDS_DIMS,
+                    UC_2_VDS_MAX_DIMS)) < 0)
+        UC_ERROR
+
+    /************************************
+     * Create source files and datasets *
+     ************************************/
+
+    start[0] = 0;
+    start[1] = 0;
+    start[2] = 0;
+
+    for(i = 0; i < UC_2_N_SOURCES; i++) {
+
+        /* source dataset dcpl */
+        if((src_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+            UC_ERROR
+        if(H5Pset_chunk(src_dcplid, RANK, UC_2_CHUNK_DIMS[i]) < 0)
+            UC_ERROR
+        if(H5Pset_fill_value(src_dcplid, UC_2_SOURCE_DATATYPE,
+                    &UC_2_FILL_VALUES[i]) < 0)
+            UC_ERROR
+        if(H5Pset_deflate(src_dcplid, COMPRESSION_LEVEL) < 0)
+            UC_ERROR
+
+        /* Create source file, dataspace, and dataset */
+        if((fid = H5Fcreate(UC_2_FILE_NAMES[i], H5F_ACC_TRUNC,
+                        H5P_DEFAULT, H5P_DEFAULT)) < 0)
+            UC_ERROR
+        if((src_sid = H5Screate_simple(RANK, UC_2_DIMS[i],
+                        UC_2_MAX_DIMS[i])) < 0)
+            UC_ERROR
+        if((did = H5Dcreate2(fid, UC_2_SOURCE_DSET_NAME,
+                        UC_2_SOURCE_DATATYPE, src_sid,
+                        H5P_DEFAULT, src_dcplid, H5P_DEFAULT)) < 0)
+            UC_ERROR
+
+        /* Set the dataset's extent (will eventually vary with i) */
+        extent[0] = UC_2_N_TEST_PLANES;
+        extent[1] = UC_2_PLANES[i][1];
+        extent[2] = UC_2_PLANES[i][2];
+        if(H5Dset_extent(did, extent) < 0)
+            UC_ERROR
+
+        /* Create a data buffer that represents a plane */
+        count = UC_2_PLANES[i][1] * UC_2_PLANES[i][2];
+        if(NULL == (buffer = (int *)malloc(count * sizeof(int))))
+            UC_ERROR
+
+        /* Create the memory dataspace */
+        if((msid = H5Screate_simple(RANK, UC_2_PLANES[i], NULL)) < 0)
+            UC_ERROR
+
+        /* Get the file dataspace */
+        if((fsid = H5Dget_space(did)) < 0)
+            UC_ERROR
+
+        /* Write planes to the dataset, number will eventually vary with i */
+        n_planes = UC_2_N_TEST_PLANES;
+        for(j = 0; j < n_planes; j++) {
+
+            value = ((i + 1) * 10) + j;
+            for(k = 0; k < count; k++)
+               buffer[k] = value; 
+
+            start[0] = j;
+            start[1] = 0;
+            start[2] = 0;
+            if(H5Sselect_hyperslab(fsid, H5S_SELECT_SET, start, NULL, UC_2_PLANES[i], NULL) < 0)
+                UC_ERROR
+            if(H5Dwrite(did, H5T_NATIVE_INT, msid, fsid, H5P_DEFAULT, buffer) < 0)
+                UC_ERROR
+
+        } /* end for */
+
+        /* set up hyperslabs for source and destination datasets */
+        start[0] = 0;
+        start[1] = 0;
+        start[2] = 0;
+        if(H5Sselect_hyperslab(src_sid, H5S_SELECT_SET, start, NULL,
+                    UC_2_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+        if(H5Sselect_hyperslab(vds_sid, H5S_SELECT_SET, UC_2_POSITIONS[i], NULL,
+                    UC_2_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+
+        /* Add VDS mapping */
+        if(H5Pset_virtual(vds_dcplid, vds_sid, UC_2_FILE_NAMES[i],
+                    UC_2_SOURCE_DSET_PATH, src_sid) < 0)
+            UC_ERROR
+
+        /* close */
+        if(H5Sclose(msid) < 0)
+            UC_ERROR
+        if(H5Sclose(fsid) < 0)
+            UC_ERROR
+        if(H5Sclose(src_sid) < 0)
+            UC_ERROR
+        if(H5Pclose(src_dcplid) < 0)
+            UC_ERROR
+        if(H5Dclose(did) < 0)
+            UC_ERROR
+        if(H5Fclose(fid) < 0)
+            UC_ERROR
+        free(buffer);
+
+    } /* end for */
+
+    /*******************************
+     * Create VDS file and dataset *
+     *******************************/
+
+    /* file */
+    if((fid = H5Fcreate(UC_2_VDS_FILE_NAME, H5F_ACC_TRUNC,
+                    H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* dataset */
+    if((did = H5Dcreate2(fid, UC_2_VDS_DSET_NAME, UC_2_VDS_DATATYPE, vds_sid,
+                    H5P_DEFAULT, vds_dcplid, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* close */
+    if(H5Pclose(vds_dcplid) < 0)
+        UC_ERROR
+    if(H5Sclose(vds_sid) < 0)
+        UC_ERROR
+    if(H5Dclose(did) < 0)
+        UC_ERROR
+    if(H5Fclose(fid) < 0)
+        UC_ERROR
+
+    return EXIT_SUCCESS;
+
+error:
+
+    H5E_BEGIN_TRY {
+        if(src_sid >= 0)
+            (void)H5Sclose(src_sid);
+        if(src_dcplid >= 0)
+            (void)H5Pclose(src_dcplid);
+        if(vds_sid >= 0)
+            (void)H5Sclose(vds_sid);
+        if(vds_dcplid >= 0)
+            (void)H5Pclose(vds_dcplid);
+        if(fid >= 0)
+            (void)H5Fclose(fid);
+        if(did >= 0)
+            (void)H5Dclose(did);
+        if(msid >= 0)
+            (void)H5Sclose(msid);
+        if(fsid >= 0)
+            (void)H5Sclose(fsid);
+        if(buffer != NULL)
+            free(buffer);
+    } H5E_END_TRY
+
+    return EXIT_FAILURE;
+
+} /* end main() */
+
diff --git a/tools/misc/vds/UC_3.h b/tools/misc/vds/UC_3.h
new file mode 100644
index 0000000..a27c3cf
--- /dev/null
+++ b/tools/misc/vds/UC_3.h
@@ -0,0 +1,78 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef UC_3_H
+#define UC_3_H
+
+#include "hdf5.h"
+
+#include "UC_1.h"
+#include "UC_2.h"
+
+/*
+ * Definitions for VDS use case 3
+ *
+ * Datasets have a single unlimited dimension and one or two fixed
+ * dimensions (they are reused from use cases 1 and 2). In this use case,
+ * the datasets are mapped in the VDS with gaps between them.
+ */
+
+/* VDS dimensions
+ * Height and width are large enough to encompass the
+ * mapped source datasets with gaps.
+ */
+#define UC_31_VDS_HEIGHT    25  /* full height + 7 (gaps of 1)  */
+#define UC_31_VDS_WIDTH     8   /* full width + 0 (no gaps)     */
+#define UC_32_VDS_HEIGHT    13  /* full height + 5              */
+#define UC_32_VDS_WIDTH     19  /* full width + 5               */
+#define UC_31_GAP           1
+
+/* VDS datatypes */
+#define UC_31_VDS_DATATYPE       H5T_STD_I32LE
+#define UC_32_VDS_DATATYPE       H5T_STD_I32LE
+
+/* Starting size of virtual datasets */
+static hsize_t UC_31_VDS_DIMS[RANK]  = {0, UC_31_VDS_HEIGHT, UC_31_VDS_WIDTH};
+static hsize_t UC_32_VDS_DIMS[RANK]  = {0, UC_32_VDS_HEIGHT, UC_32_VDS_WIDTH};
+
+/* Maximum size of virtual datasets */
+static hsize_t UC_31_VDS_MAX_DIMS[RANK]  = {UC_1_N_MAX_PLANES, UC_31_VDS_HEIGHT, UC_31_VDS_WIDTH};
+static hsize_t UC_32_VDS_MAX_DIMS[RANK]  = {UC_2_N_MAX_PLANES, UC_32_VDS_HEIGHT, UC_32_VDS_WIDTH};
+
+/* Positions of mapped source datasets */
+static hsize_t UC_32_POSITIONS[UC_2_N_SOURCES][RANK] = {
+    /* A */ {0,  1,  1},
+    /* B */ {0,  4,  0},
+    /* C */ {0, 11,  4},
+    /* D */ {0,  1,  9},
+    /* E */ {0,  8, 12}
+};
+
+/* Planes */
+static hsize_t UC_31_VDS_PLANE[RANK]    = {1, UC_31_VDS_HEIGHT, UC_31_VDS_WIDTH};
+static hsize_t UC_32_VDS_PLANE[RANK]    = {1, UC_32_VDS_HEIGHT, UC_32_VDS_WIDTH};
+
+/* VDS file names */
+#define UC_31_VDS_FILE_NAME     "3_1_vds.h5"
+#define UC_32_VDS_FILE_NAME     "3_2_vds.h5"
+
+/* Dataset name */
+#define UC_3_VDS_DSET_NAME      "vds_dset"
+
+/* Fill value */
+static int UC_3_VDS_FILL_VALUE      = -9;
+
+#endif /* UC_3_H */
+
diff --git a/tools/misc/vds/UC_3_gaps_gen.c b/tools/misc/vds/UC_3_gaps_gen.c
new file mode 100644
index 0000000..1f150c1
--- /dev/null
+++ b/tools/misc/vds/UC_3_gaps_gen.c
@@ -0,0 +1,255 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * File/dataset generator for VDS use case 3
+ *
+ * See the header file for a description.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <hdf5.h>
+
+#include "UC_common.h"
+#include "UC_3.h"
+
+/* Create the VDS that uses use case 1 files */
+herr_t
+create_3_1_vds(void)
+{
+    hid_t src_sid       = -1;   /* source dataset's dataspace ID            */
+    hid_t vds_sid       = -1;   /* VDS dataspace ID                         */
+    hid_t vds_dcplid    = -1;   /* VDS dataset property list ID             */
+
+    hid_t fid           = -1;   /* HDF5 file ID                             */
+    hid_t did           = -1;   /* dataset ID                               */
+
+    hsize_t start[RANK];        /* source starting point for hyperslab      */
+    hsize_t position[RANK];     /* vds mapping positions                    */
+
+    int i;                      /* iterator                                 */
+
+    /* Create VDS dcpl */
+    if((vds_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        UC_ERROR
+    if(H5Pset_fill_value(vds_dcplid, UC_31_VDS_DATATYPE,
+                &UC_3_VDS_FILL_VALUE) < 0)
+        UC_ERROR
+
+    /* Create VDS dataspace */
+    if((vds_sid = H5Screate_simple(RANK, UC_31_VDS_DIMS,
+                    UC_31_VDS_MAX_DIMS)) < 0)
+        UC_ERROR
+
+    /* Set starting positions */
+    start[0] = 0;
+    start[1] = 0;
+    start[2] = 0;
+
+    position[0] = 0;
+    position[1] = UC_31_GAP;
+    position[2] = 0;
+
+    /******************************
+     * Create source-VDS mappings *
+     ******************************/
+    for(i = 0; i < UC_1_N_SOURCES; i++) {
+
+        if((src_sid = H5Screate_simple(RANK, UC_1_DIMS[i],
+                    UC_1_MAX_DIMS[i])) < 0)
+        UC_ERROR
+
+        /* set up hyperslabs for source and destination datasets */
+        if(H5Sselect_hyperslab(src_sid, H5S_SELECT_SET, start, NULL,
+                    UC_1_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+        if(H5Sselect_hyperslab(vds_sid, H5S_SELECT_SET, position,
+                    NULL, UC_1_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+        position[1] += UC_1_DIMS[i][1] + UC_31_GAP;
+
+        /* Add VDS mapping */
+        if(H5Pset_virtual(vds_dcplid, vds_sid, UC_1_FILE_NAMES[i],
+                    UC_1_SOURCE_DSET_PATH, src_sid) < 0)
+            UC_ERROR
+        if(H5Sclose(src_sid) < 0)
+            UC_ERROR
+
+    } /* end for */
+
+    /*******************************
+     * Create VDS file and dataset *
+     *******************************/
+
+    /* file */
+    if((fid = H5Fcreate(UC_31_VDS_FILE_NAME, H5F_ACC_TRUNC,
+                    H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* dataset */
+    if((did = H5Dcreate2(fid, UC_3_VDS_DSET_NAME, UC_31_VDS_DATATYPE, vds_sid,
+                    H5P_DEFAULT, vds_dcplid, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* close */
+    if(H5Pclose(vds_dcplid) < 0)
+        UC_ERROR
+    if(H5Sclose(vds_sid) < 0)
+        UC_ERROR
+    if(H5Dclose(did) < 0)
+        UC_ERROR
+    if(H5Fclose(fid) < 0)
+        UC_ERROR
+
+    return 0;
+
+error:
+
+    H5E_BEGIN_TRY {
+        if(vds_sid >= 0)
+            (void)H5Sclose(vds_sid);
+        if(vds_dcplid >= 0)
+            (void)H5Pclose(vds_dcplid);
+        if(fid >= 0)
+            (void)H5Fclose(fid);
+        if(did >= 0)
+            (void)H5Dclose(did);
+    } H5E_END_TRY
+
+    return -1;
+
+} /* end create_3_1_vds() */
+
+/* Create the VDS that uses use case 2 files */
+herr_t
+create_3_2_vds(void)
+{
+    hid_t src_sid       = -1;   /* source dataset's dataspace ID            */
+    hid_t vds_sid       = -1;   /* VDS dataspace ID                         */
+    hid_t vds_dcplid    = -1;   /* VDS dataset property list ID             */
+
+    hid_t fid           = -1;   /* HDF5 file ID                             */
+    hid_t did           = -1;   /* dataset ID                               */
+
+    hsize_t start[RANK];        /* source starting point for hyperslab      */
+
+    int i;                      /* iterator                                 */
+
+    /* Create VDS dcpl */
+    if((vds_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        UC_ERROR
+    if(H5Pset_fill_value(vds_dcplid, UC_32_VDS_DATATYPE,
+                &UC_3_VDS_FILL_VALUE) < 0)
+        UC_ERROR
+
+    /* Create VDS dataspace */
+    if((vds_sid = H5Screate_simple(RANK, UC_32_VDS_DIMS,
+                    UC_32_VDS_MAX_DIMS)) < 0)
+        UC_ERROR
+
+    /* Set starting positions */
+    start[0] = 0;
+    start[1] = 0;
+    start[2] = 0;
+
+    /******************************
+     * Create source-VDS mappings *
+     ******************************/
+    for(i = 0; i < UC_2_N_SOURCES; i++) {
+
+        if((src_sid = H5Screate_simple(RANK, UC_2_DIMS[i],
+                    UC_2_MAX_DIMS[i])) < 0)
+        UC_ERROR
+
+        /* set up hyperslabs for source and destination datasets */
+        if(H5Sselect_hyperslab(src_sid, H5S_SELECT_SET, start, NULL,
+                    UC_2_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+        if(H5Sselect_hyperslab(vds_sid, H5S_SELECT_SET, UC_32_POSITIONS[i],
+                    NULL, UC_2_MAX_DIMS[i], NULL) < 0)
+            UC_ERROR
+
+        /* Add VDS mapping */
+        if(H5Pset_virtual(vds_dcplid, vds_sid, UC_2_FILE_NAMES[i],
+                    UC_2_SOURCE_DSET_PATH, src_sid) < 0)
+            UC_ERROR
+        if(H5Sclose(src_sid) < 0)
+            UC_ERROR
+
+    } /* end for */
+
+    /*******************************
+     * Create VDS file and dataset *
+     *******************************/
+
+    /* file */
+    if((fid = H5Fcreate(UC_32_VDS_FILE_NAME, H5F_ACC_TRUNC,
+                    H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* dataset */
+    if((did = H5Dcreate2(fid, UC_3_VDS_DSET_NAME, UC_32_VDS_DATATYPE, vds_sid,
+                    H5P_DEFAULT, vds_dcplid, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* close */
+    if(H5Pclose(vds_dcplid) < 0)
+        UC_ERROR
+    if(H5Sclose(vds_sid) < 0)
+        UC_ERROR
+    if(H5Dclose(did) < 0)
+        UC_ERROR
+    if(H5Fclose(fid) < 0)
+        UC_ERROR
+
+    return 0;
+
+error:
+
+    H5E_BEGIN_TRY {
+        if(vds_sid >= 0)
+            (void)H5Sclose(vds_sid);
+        if(vds_dcplid >= 0)
+            (void)H5Pclose(vds_dcplid);
+        if(fid >= 0)
+            (void)H5Fclose(fid);
+        if(did >= 0)
+            (void)H5Dclose(did);
+    } H5E_END_TRY
+
+    return -1;
+
+} /* end create_3_2_vds() */
+
+int
+main(int argc, char *argv[])
+{
+
+    if(create_3_1_vds() < 0)
+        UC_ERROR
+
+    if(create_3_2_vds() < 0)
+        UC_ERROR
+
+    return EXIT_SUCCESS;
+
+error:
+
+    return EXIT_FAILURE;
+
+} /* end main() */
+
diff --git a/tools/misc/vds/UC_4.h b/tools/misc/vds/UC_4.h
new file mode 100644
index 0000000..ce74e63
--- /dev/null
+++ b/tools/misc/vds/UC_4.h
@@ -0,0 +1,86 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef UC_4_H
+#define UC_4_H
+
+#include "hdf5.h"
+
+#include "UC_common.h"
+
+/*
+ * Definitions for VDS use case 4
+ *
+ * Source datasets have three fixed dimensions. In this use case, the
+ * datasets are mapped consecutively in the VDS along a single dimension with
+ * no gaps between them. Datasets are automatically loaded using a
+ * printf-like format string for the file name.
+ */
+
+/* virtual dataset <---> source dataset mapping and sizes */
+
+#define UC_4_N_SOURCES      3
+
+/* Dataset dimensions */
+#define UC_4_SRC_PLANES     3
+#define UC_4_HEIGHT         4
+#define UC_4_WIDTH          4
+
+/* max number of planes for VDS (sources are finite) */
+#define UC_4_VDS_MAX_PLANES   H5S_UNLIMITED
+#define UC_4_N_TEST_PLANES    9                 /* number of planes in the VDS */
+
+/* Dataset datatypes */
+#define UC_4_SOURCE_DATATYPE    H5T_STD_I32LE
+#define UC_4_VDS_DATATYPE       H5T_STD_I32LE
+
+/* Starting size of datasets, both source and VDS */
+static hsize_t UC_4_SOURCE_DIMS[RANK] = {0, UC_4_HEIGHT, UC_4_WIDTH};
+static hsize_t UC_4_VDS_DIMS[RANK] = {0, UC_4_HEIGHT, UC_4_WIDTH};
+
+/* Max size of datasets, both source and VDS */
+static hsize_t UC_4_SOURCE_MAX_DIMS[RANK] = {UC_4_SRC_PLANES, UC_4_HEIGHT, UC_4_WIDTH};
+static hsize_t UC_4_VDS_MAX_DIMS[RANK] = {UC_4_VDS_MAX_PLANES, UC_4_HEIGHT, UC_4_WIDTH};
+
+/* Planes (both source and VDS) */
+static hsize_t UC_4_PLANE[RANK] = {1, UC_4_HEIGHT, UC_4_WIDTH};
+
+/* File names for source datasets */
+static char UC_4_FILE_NAMES[UC_4_N_SOURCES][NAME_LEN] = {
+    {"4_0.h5"},
+    {"4_1.h5"},
+    {"4_2.h5"}
+};
+static char UC_4_MAPPING_FILE_NAME[NAME_LEN] = "4_%b.h5";
+
+/* VDS file name */
+static char UC_4_VDS_FILE_NAME[NAME_LEN] = "4_vds.h5";
+
+/* Dataset names */
+static char UC_4_SOURCE_DSET_NAME[NAME_LEN] = "source_dset";
+static char UC_4_SOURCE_DSET_PATH[NAME_LEN] = "/source_dset";
+static char UC_4_VDS_DSET_NAME[NAME_LEN]    = "vds_dset";
+
+/* Fill values */
+static hsize_t UC_4_FILL_VALUES[UC_4_N_SOURCES] = {
+    -1,
+    -2,
+    -3
+};
+static int UC_4_VDS_FILL_VALUE = -9;
+
+#endif /* UC_4_H */
+
+
diff --git a/tools/misc/vds/UC_4_printf_gen.c b/tools/misc/vds/UC_4_printf_gen.c
new file mode 100644
index 0000000..c8e111a
--- /dev/null
+++ b/tools/misc/vds/UC_4_printf_gen.c
@@ -0,0 +1,219 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * File/dataset generator for VDS use case 4
+ *
+ * See the header file for a description.
+ */
+
+#include <stdlib.h>
+
+#include <hdf5.h>
+
+#include "UC_common.h"
+#include "UC_4.h"
+
+int
+main(int argc, char *argv[])
+{
+    hid_t src_sid       = -1;   /* source dataset's dataspace ID            */
+    hid_t src_dcplid    = -1;   /* source dataset property list ID          */
+
+    hid_t vds_sid       = -1;   /* VDS dataspace ID                         */
+    hid_t vds_dcplid    = -1;   /* VDS dataset property list ID             */
+
+    hid_t fid           = -1;   /* HDF5 file ID                             */
+    hid_t did           = -1;   /* dataset ID                               */
+    hid_t msid          = -1;   /* memory dataspace ID                      */
+    hid_t fsid          = -1;   /* file dataspace ID                        */
+
+    /* Hyperslab arrays */
+    hsize_t start[RANK] = {0, 0, 0};
+    hsize_t count[RANK] = {H5S_UNLIMITED, 1, 1};
+
+    int *buffer         = NULL; /* data buffer                              */
+    int value           = -1;   /* value written to datasets                */
+
+    hsize_t n           = 0;    /* number of elements in a plane            */
+
+    int i;                      /* iterator                                 */
+    int j;                      /* iterator                                 */
+    int k;                      /* iterator                                 */
+
+    /************************************
+     * Create source files and datasets *
+     ************************************/
+
+    /* Create source dataspace ID */
+    if((src_sid = H5Screate_simple(RANK, UC_4_SOURCE_DIMS,
+                    UC_4_SOURCE_MAX_DIMS)) < 0)
+        UC_ERROR
+    if(H5Sselect_hyperslab(src_sid, H5S_SELECT_SET, start, NULL,
+                UC_4_SOURCE_MAX_DIMS, NULL) < 0)
+        UC_ERROR
+
+    /* Create source files and datasets */
+    for(i = 0; i < UC_4_N_SOURCES; i++) {
+
+        /* source dataset dcpl */
+        if((src_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+            UC_ERROR
+        if(H5Pset_chunk(src_dcplid, RANK, UC_4_PLANE) < 0)
+            UC_ERROR
+        if(H5Pset_fill_value(src_dcplid, UC_4_SOURCE_DATATYPE,
+                    &UC_4_FILL_VALUES[i]) < 0)
+            UC_ERROR
+        if(H5Pset_deflate(src_dcplid, COMPRESSION_LEVEL) < 0)
+            UC_ERROR
+
+        /* Create source file and dataset */
+        if((fid = H5Fcreate(UC_4_FILE_NAMES[i], H5F_ACC_TRUNC,
+                        H5P_DEFAULT, H5P_DEFAULT)) < 0)
+            UC_ERROR
+        if((did = H5Dcreate2(fid, UC_4_SOURCE_DSET_NAME,
+                        UC_4_SOURCE_DATATYPE, src_sid,
+                        H5P_DEFAULT, src_dcplid, H5P_DEFAULT)) < 0)
+            UC_ERROR
+
+        /* Set the dataset's extent */
+        if(H5Dset_extent(did, UC_4_SOURCE_MAX_DIMS) < 0)
+            UC_ERROR
+
+        /* Create a data buffer that represents a plane */
+        n = UC_4_PLANE[1] * UC_4_PLANE[2];
+        if(NULL == (buffer = (int *)malloc(n * sizeof(int))))
+            UC_ERROR
+
+        /* Create the memory dataspace */
+        if((msid = H5Screate_simple(RANK, UC_4_PLANE, NULL)) < 0)
+            UC_ERROR
+
+        /* Get the file dataspace */
+        if((fsid = H5Dget_space(did)) < 0)
+            UC_ERROR
+
+        /* Write planes to the dataset */
+        for(j = 0; j < UC_4_SRC_PLANES; j++) {
+
+            value = ((i + 1) * 10) + j;
+            for(k = 0; k < n; k++)
+               buffer[k] = value;
+
+            start[0] = j;
+            start[1] = 0;
+            start[2] = 0;
+            if(H5Sselect_hyperslab(fsid, H5S_SELECT_SET, start, NULL, UC_4_PLANE, NULL) < 0)
+                UC_ERROR
+            if(H5Dwrite(did, H5T_NATIVE_INT, msid, fsid, H5P_DEFAULT, buffer) < 0)
+                UC_ERROR
+
+        } /* end for */
+
+        /* close */
+        if(H5Sclose(msid) < 0)
+            UC_ERROR
+        if(H5Sclose(fsid) < 0)
+            UC_ERROR
+        if(H5Pclose(src_dcplid) < 0)
+            UC_ERROR
+        if(H5Dclose(did) < 0)
+            UC_ERROR
+        if(H5Fclose(fid) < 0)
+            UC_ERROR
+        free(buffer);
+
+    } /* end for */
+
+    /*******************
+     * Create VDS file *
+     *******************/
+
+    /* Create file */
+    if((fid = H5Fcreate(UC_4_VDS_FILE_NAME, H5F_ACC_TRUNC,
+                    H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* Create VDS dcpl */
+    if((vds_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        UC_ERROR
+    if(H5Pset_fill_value(vds_dcplid, UC_4_VDS_DATATYPE,
+                &UC_4_VDS_FILL_VALUE) < 0)
+        UC_ERROR
+
+    /* Create VDS dataspace */
+    if((vds_sid = H5Screate_simple(RANK, UC_4_VDS_DIMS,
+                    UC_4_VDS_MAX_DIMS)) < 0)
+        UC_ERROR
+    start[0] = 0;
+    start[1] = 0;
+    start[2] = 0;
+    if(H5Sselect_hyperslab(vds_sid, H5S_SELECT_SET, start,
+                UC_4_SOURCE_MAX_DIMS, count, UC_4_SOURCE_MAX_DIMS) < 0)
+        UC_ERROR
+
+    /* Add VDS mapping - The mapped file name uses a printf-like
+     * naming scheme that automatically maps new files.
+     */
+    if(H5Pset_virtual(vds_dcplid, vds_sid, UC_4_MAPPING_FILE_NAME,
+                UC_4_SOURCE_DSET_PATH, src_sid) < 0)
+        UC_ERROR
+
+    /* Create dataset */
+    if((did = H5Dcreate2(fid, UC_4_VDS_DSET_NAME, UC_4_VDS_DATATYPE, vds_sid,
+                    H5P_DEFAULT, vds_dcplid, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* close */
+    if(H5Sclose(src_sid) < 0)
+        UC_ERROR
+    if(H5Pclose(vds_dcplid) < 0)
+        UC_ERROR
+    if(H5Sclose(vds_sid) < 0)
+        UC_ERROR
+    if(H5Dclose(did) < 0)
+        UC_ERROR
+    if(H5Fclose(fid) < 0)
+        UC_ERROR
+
+    return EXIT_SUCCESS;
+
+error:
+
+    H5E_BEGIN_TRY {
+        if(src_sid >= 0)
+            (void)H5Sclose(src_sid);
+        if(src_dcplid >= 0)
+            (void)H5Pclose(src_dcplid);
+        if(vds_sid >= 0)
+            (void)H5Sclose(vds_sid);
+        if(vds_dcplid >= 0)
+            (void)H5Pclose(vds_dcplid);
+        if(fid >= 0)
+            (void)H5Fclose(fid);
+        if(did >= 0)
+            (void)H5Dclose(did);
+        if(msid >= 0)
+            (void)H5Sclose(msid);
+        if(fsid >= 0)
+            (void)H5Sclose(fsid);
+        if(buffer != NULL)
+            free(buffer);
+    } H5E_END_TRY
+
+    return EXIT_FAILURE;
+
+} /* end main() */
+
diff --git a/tools/misc/vds/UC_5.h b/tools/misc/vds/UC_5.h
new file mode 100644
index 0000000..b22b177
--- /dev/null
+++ b/tools/misc/vds/UC_5.h
@@ -0,0 +1,83 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef UC_5_H
+#define UC_5_H
+
+#include <hdf5.h>
+
+#include "UC_common.h"
+
+/*
+ * Definitions for VDS use case 5
+ *
+ * Source datasets have one unlimited dimension and two fixed dimensions. In
+ * this use case, the datasets are mapped in the VDS so that alternating
+ * planes in the source are interleaved in the VDS.
+ */
+
+/* virtual dataset <---> source dataset mapping and sizes */
+
+#define UC_5_N_SOURCES      3
+
+/* Dataset dimensions */
+#define UC_5_SRC_PLANES     3
+#define UC_5_HEIGHT         4
+#define UC_5_WIDTH          4
+
+/* max number of planes for datasets */
+#define UC_5_MAX_PLANES     H5S_UNLIMITED
+#define UC_5_N_TEST_PLANES  9               /* number of planes in VDS */
+
+/* Dataset datatypes */
+#define UC_5_SOURCE_DATATYPE    H5T_STD_I32LE
+#define UC_5_VDS_DATATYPE       H5T_STD_I32LE
+
+/* Starting size of datasets, both source and VDS */
+static hsize_t UC_5_SOURCE_DIMS[RANK] = {0, UC_5_HEIGHT, UC_5_WIDTH};
+static hsize_t UC_5_VDS_DIMS[RANK]    = {0, UC_5_HEIGHT, UC_5_WIDTH};
+
+/* Max size of datasets, both source and VDS */
+static hsize_t UC_5_SOURCE_MAX_DIMS[RANK] = {UC_5_MAX_PLANES, UC_5_HEIGHT, UC_5_WIDTH};
+static hsize_t UC_5_VDS_MAX_DIMS[RANK]    = {UC_5_MAX_PLANES, UC_5_HEIGHT, UC_5_WIDTH};
+
+/* Planes (both source and VDS) */
+static hsize_t UC_5_PLANE[RANK] = {1, UC_5_HEIGHT, UC_5_WIDTH};
+
+/* File names for source datasets */
+static char UC_5_FILE_NAMES[UC_5_N_SOURCES][NAME_LEN] = {
+    {"5_a.h5"},
+    {"5_b.h5"},
+    {"5_c.h5"}
+};
+
+/* VDS file name */
+static char UC_5_VDS_FILE_NAME[NAME_LEN] = "5_vds.h5";
+
+/* Dataset names */
+static char UC_5_SOURCE_DSET_NAME[NAME_LEN] = "source_dset";
+static char UC_5_SOURCE_DSET_PATH[NAME_LEN] = "/source_dset";
+static char UC_5_VDS_DSET_NAME[NAME_LEN]    = "vds_dset";
+
+/* Fill values */
+static hsize_t UC_5_FILL_VALUES[UC_5_N_SOURCES] = {
+    -1,
+    -2,
+    -3
+};
+static int UC_5_VDS_FILL_VALUE = -9;
+
+#endif /* UC_5_H */
+
diff --git a/tools/misc/vds/UC_5_stride_gen.c b/tools/misc/vds/UC_5_stride_gen.c
new file mode 100644
index 0000000..984aadc
--- /dev/null
+++ b/tools/misc/vds/UC_5_stride_gen.c
@@ -0,0 +1,243 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * File/dataset generator for VDS use case 5
+ *
+ * See the header file for a description.
+ */
+
+#include <stdlib.h>
+
+#include <hdf5.h>
+
+#include "UC_common.h"
+#include "UC_5.h"
+
+int
+main(int argc, char *argv[])
+{
+    hid_t src_sid       = -1;   /* source dataset's dataspace ID            */
+    hid_t src_dcplid    = -1;   /* source dataset property list ID          */
+
+    hid_t vds_sid       = -1;   /* VDS dataspace ID                         */
+    hid_t vds_dcplid    = -1;   /* VDS dataset property list ID             */
+
+    hid_t fid           = -1;   /* HDF5 file ID                             */
+    hid_t did           = -1;   /* dataset ID                               */
+    hid_t msid          = -1;   /* memory dataspace ID                      */
+    hid_t fsid          = -1;   /* file dataspace ID                        */
+
+    hsize_t extent[RANK];       /* source dataset extents                   */
+    hsize_t start[RANK];        /* starting point for hyperslab             */
+    hsize_t stride[RANK];       /* hypserslab stride                        */
+    hsize_t count[RANK];        /* hypserslab count                         */
+    int map_start       = -1;   /* starting point in the VDS map            */
+
+    int *buffer         = NULL; /* data buffer                              */
+    int value           = -1;   /* value written to datasets                */
+
+    hsize_t n           = 0;    /* number of elements in a plane            */
+
+    int i;                      /* iterator                                 */
+    int j;                      /* iterator                                 */
+    int k;                      /* iterator                                 */
+
+    /* Start by creating the virtual dataset (VDS) dataspace and creation
+     * property list. The individual source datasets are then created
+     * and the VDS map (stored in the VDS property list) is updated.
+     */
+
+    /* Create VDS dcpl */
+    if((vds_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        UC_ERROR
+    if(H5Pset_fill_value(vds_dcplid, UC_5_VDS_DATATYPE,
+                &UC_5_VDS_FILL_VALUE) < 0)
+        UC_ERROR
+
+    /* Create VDS dataspace */
+    if((vds_sid = H5Screate_simple(RANK, UC_5_VDS_DIMS,
+                    UC_5_VDS_MAX_DIMS)) < 0)
+        UC_ERROR
+
+    /*********************************
+     * Map source files and datasets *
+     *********************************/
+
+    /* Hyperslab array setup */
+    start[0] = 0;
+    start[1] = 0;
+    start[2] = 0;
+    map_start = 0;
+
+    stride[0] = UC_5_N_SOURCES;
+    stride[1] = 1;
+    stride[2] = 1;
+
+    count[0] = H5S_UNLIMITED;
+    count[1] = 1;
+    count[2] = 1;
+
+    extent[0] = UC_5_SRC_PLANES;
+    extent[1] = UC_5_HEIGHT;
+    extent[2] = UC_5_WIDTH;
+
+    for(i = 0; i < UC_5_N_SOURCES; i++) {
+
+        /* source dataset dcpl */
+        if((src_dcplid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+            UC_ERROR
+        if(H5Pset_chunk(src_dcplid, RANK, UC_5_PLANE) < 0)
+            UC_ERROR
+        if(H5Pset_fill_value(src_dcplid, UC_5_SOURCE_DATATYPE,
+                    &UC_5_FILL_VALUES[i]) < 0)
+            UC_ERROR
+        if(H5Pset_deflate(src_dcplid, COMPRESSION_LEVEL) < 0)
+            UC_ERROR
+
+        /* Create source file, dataspace, and dataset */
+        if((fid = H5Fcreate(UC_5_FILE_NAMES[i], H5F_ACC_TRUNC,
+                        H5P_DEFAULT, H5P_DEFAULT)) < 0)
+            UC_ERROR
+        if((src_sid = H5Screate_simple(RANK, UC_5_SOURCE_DIMS,
+                        UC_5_SOURCE_MAX_DIMS)) < 0)
+            UC_ERROR
+        if((did = H5Dcreate2(fid, UC_5_SOURCE_DSET_NAME,
+                        UC_5_SOURCE_DATATYPE, src_sid,
+                        H5P_DEFAULT, src_dcplid, H5P_DEFAULT)) < 0)
+            UC_ERROR
+
+        /* Set the dataset's extent */
+        if(H5Dset_extent(did, extent) < 0)
+            UC_ERROR
+
+        /* Create a data buffer that represents a plane */
+        n = UC_5_PLANE[1] * UC_5_PLANE[2];
+        if(NULL == (buffer = (int *)malloc(n * sizeof(int))))
+            UC_ERROR
+
+        /* Create the memory dataspace */
+        if((msid = H5Screate_simple(RANK, UC_5_PLANE, NULL)) < 0)
+            UC_ERROR
+
+        /* Get the file dataspace */
+        if((fsid = H5Dget_space(did)) < 0)
+            UC_ERROR
+
+        /* Write planes to the dataset */
+        for(j = 0; j < UC_5_SRC_PLANES; j++) {
+
+            value = ((i + 1) * 10) + j;
+            for(k = 0; k < n; k++)
+               buffer[k] = value;
+
+            start[0] = j;
+            start[1] = 0;
+            start[2] = 0;
+            if(H5Sselect_hyperslab(fsid, H5S_SELECT_SET, start, NULL, UC_5_PLANE, NULL) < 0)
+                UC_ERROR
+            if(H5Dwrite(did, H5T_NATIVE_INT, msid, fsid, H5P_DEFAULT, buffer) < 0)
+                UC_ERROR
+
+        } /* end for */
+
+        /* set up hyperslabs for source and destination datasets */
+        start[0] = 0;
+        start[1] = 0;
+        start[2] = 0;
+        if(H5Sselect_hyperslab(src_sid, H5S_SELECT_SET, start, NULL,
+                    UC_5_SOURCE_MAX_DIMS, NULL) < 0)
+            UC_ERROR
+        start[0] = map_start;
+        if(H5Sselect_hyperslab(vds_sid, H5S_SELECT_SET, start, stride,
+                    count, UC_5_PLANE) < 0)
+            UC_ERROR
+        map_start += 1;
+
+        /* Add VDS mapping */
+        if(H5Pset_virtual(vds_dcplid, vds_sid, UC_5_FILE_NAMES[i],
+                    UC_5_SOURCE_DSET_PATH, src_sid) < 0)
+            UC_ERROR
+
+        /* close */
+        if(H5Sclose(msid) < 0)
+            UC_ERROR
+        if(H5Sclose(fsid) < 0)
+            UC_ERROR
+        if(H5Sclose(src_sid) < 0)
+            UC_ERROR
+        if(H5Pclose(src_dcplid) < 0)
+            UC_ERROR
+        if(H5Dclose(did) < 0)
+            UC_ERROR
+        if(H5Fclose(fid) < 0)
+            UC_ERROR
+        free(buffer);
+
+    } /* end for */
+
+    /*******************
+     * Create VDS file *
+     *******************/
+
+    /* file */
+    if((fid = H5Fcreate(UC_5_VDS_FILE_NAME, H5F_ACC_TRUNC,
+                    H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* dataset */
+    if((did = H5Dcreate2(fid, UC_5_VDS_DSET_NAME, UC_5_VDS_DATATYPE, vds_sid,
+                    H5P_DEFAULT, vds_dcplid, H5P_DEFAULT)) < 0)
+        UC_ERROR
+
+    /* close */
+    if(H5Pclose(vds_dcplid) < 0)
+        UC_ERROR
+    if(H5Sclose(vds_sid) < 0)
+        UC_ERROR
+    if(H5Dclose(did) < 0)
+        UC_ERROR
+    if(H5Fclose(fid) < 0)
+        UC_ERROR
+
+    return EXIT_SUCCESS;
+
+error:
+
+    H5E_BEGIN_TRY {
+        if(src_sid >= 0)
+            (void)H5Sclose(src_sid);
+        if(src_dcplid >= 0)
+            (void)H5Pclose(src_dcplid);
+        if(vds_sid >= 0)
+            (void)H5Sclose(vds_sid);
+        if(vds_dcplid >= 0)
+            (void)H5Pclose(vds_dcplid);
+        if(fid >= 0)
+            (void)H5Fclose(fid);
+        if(did >= 0)
+            (void)H5Dclose(did);
+        if(msid >= 0)
+            (void)H5Sclose(msid);
+        if(fsid >= 0)
+            (void)H5Sclose(fsid);
+        if(buffer != NULL)
+            free(buffer);
+    } H5E_END_TRY
+
+    return EXIT_FAILURE;
+
+} /* end main() */
+
diff --git a/tools/misc/vds/UC_common.h b/tools/misc/vds/UC_common.h
new file mode 100644
index 0000000..0e61016
--- /dev/null
+++ b/tools/misc/vds/UC_common.h
@@ -0,0 +1,41 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef USE_CASE_COMMON_H
+#define USE_CASE_COMMON_H
+
+/******************************************
+ * Symbols used across multiple use cases *
+ ******************************************/
+
+/* All datasets are 3D */
+#define RANK                3
+
+/* Lengths of string identifiers (file, dataset names, etc.) */
+#define NAME_LEN            32
+
+/* Compression level */
+#define COMPRESSION_LEVEL   7
+
+/* Booleans */
+#define TRUE 1
+#define FALSE 0
+
+/* Testing macros */
+#define AT()        printf ("   at %s:%d in %s()...\n", __FILE__, __LINE__, __func__);
+#define UC_ERROR    {puts("*ERROR*"); fflush(stdout); AT(); goto error;}
+
+#endif /* USE_CASE_COMMON_H */
+
diff --git a/tools/testfiles/vds/1_a.h5 b/tools/testfiles/vds/1_a.h5
new file mode 100644
index 0000000..953d33d
--- /dev/null
+++ b/tools/testfiles/vds/1_a.h5
diff --git a/tools/testfiles/vds/1_b.h5 b/tools/testfiles/vds/1_b.h5
new file mode 100644
index 0000000..6ba95e6
--- /dev/null
+++ b/tools/testfiles/vds/1_b.h5
diff --git a/tools/testfiles/vds/1_c.h5 b/tools/testfiles/vds/1_c.h5
new file mode 100644
index 0000000..4bcebbd
--- /dev/null
+++ b/tools/testfiles/vds/1_c.h5
diff --git a/tools/testfiles/vds/1_d.h5 b/tools/testfiles/vds/1_d.h5
new file mode 100644
index 0000000..9c2d795
--- /dev/null
+++ b/tools/testfiles/vds/1_d.h5
diff --git a/tools/testfiles/vds/1_e.h5 b/tools/testfiles/vds/1_e.h5
new file mode 100644
index 0000000..4f7aa7b
--- /dev/null
+++ b/tools/testfiles/vds/1_e.h5
diff --git a/tools/testfiles/vds/1_f.h5 b/tools/testfiles/vds/1_f.h5
new file mode 100644
index 0000000..62e86bc
--- /dev/null
+++ b/tools/testfiles/vds/1_f.h5
diff --git a/tools/testfiles/vds/1_vds.h5 b/tools/testfiles/vds/1_vds.h5
new file mode 100644
index 0000000..707a37f
--- /dev/null
+++ b/tools/testfiles/vds/1_vds.h5
diff --git a/tools/testfiles/vds/2_a.h5 b/tools/testfiles/vds/2_a.h5
new file mode 100644
index 0000000..5227e9e
--- /dev/null
+++ b/tools/testfiles/vds/2_a.h5
diff --git a/tools/testfiles/vds/2_b.h5 b/tools/testfiles/vds/2_b.h5
new file mode 100644
index 0000000..34723a3
--- /dev/null
+++ b/tools/testfiles/vds/2_b.h5
diff --git a/tools/testfiles/vds/2_c.h5 b/tools/testfiles/vds/2_c.h5
new file mode 100644
index 0000000..d2252fc
--- /dev/null
+++ b/tools/testfiles/vds/2_c.h5
diff --git a/tools/testfiles/vds/2_d.h5 b/tools/testfiles/vds/2_d.h5
new file mode 100644
index 0000000..6880c2e
--- /dev/null
+++ b/tools/testfiles/vds/2_d.h5
diff --git a/tools/testfiles/vds/2_e.h5 b/tools/testfiles/vds/2_e.h5
new file mode 100644
index 0000000..81ffacc
--- /dev/null
+++ b/tools/testfiles/vds/2_e.h5
diff --git a/tools/testfiles/vds/2_vds.h5 b/tools/testfiles/vds/2_vds.h5
new file mode 100644
index 0000000..cbef59c
--- /dev/null
+++ b/tools/testfiles/vds/2_vds.h5
diff --git a/tools/testfiles/vds/3_1_vds.h5 b/tools/testfiles/vds/3_1_vds.h5
new file mode 100644
index 0000000..e66e4c7
--- /dev/null
+++ b/tools/testfiles/vds/3_1_vds.h5
diff --git a/tools/testfiles/vds/3_2_vds.h5 b/tools/testfiles/vds/3_2_vds.h5
new file mode 100644
index 0000000..a19dab5
--- /dev/null
+++ b/tools/testfiles/vds/3_2_vds.h5
diff --git a/tools/testfiles/vds/4_0.h5 b/tools/testfiles/vds/4_0.h5
new file mode 100644
index 0000000..5e71d20
--- /dev/null
+++ b/tools/testfiles/vds/4_0.h5
diff --git a/tools/testfiles/vds/4_1.h5 b/tools/testfiles/vds/4_1.h5
new file mode 100644
index 0000000..edad46e
--- /dev/null
+++ b/tools/testfiles/vds/4_1.h5
diff --git a/tools/testfiles/vds/4_2.h5 b/tools/testfiles/vds/4_2.h5
new file mode 100644
index 0000000..a82b012
--- /dev/null
+++ b/tools/testfiles/vds/4_2.h5
diff --git a/tools/testfiles/vds/4_vds.h5 b/tools/testfiles/vds/4_vds.h5
new file mode 100644
index 0000000..64c2288
--- /dev/null
+++ b/tools/testfiles/vds/4_vds.h5
diff --git a/tools/testfiles/vds/5_a.h5 b/tools/testfiles/vds/5_a.h5
new file mode 100644
index 0000000..e8ea552
--- /dev/null
+++ b/tools/testfiles/vds/5_a.h5
diff --git a/tools/testfiles/vds/5_b.h5 b/tools/testfiles/vds/5_b.h5
new file mode 100644
index 0000000..6da7cf5
--- /dev/null
+++ b/tools/testfiles/vds/5_b.h5
diff --git a/tools/testfiles/vds/5_c.h5 b/tools/testfiles/vds/5_c.h5
new file mode 100644
index 0000000..3e3bc61
--- /dev/null
+++ b/tools/testfiles/vds/5_c.h5
diff --git a/tools/testfiles/vds/5_vds.h5 b/tools/testfiles/vds/5_vds.h5
new file mode 100644
index 0000000..379485e
--- /dev/null
+++ b/tools/testfiles/vds/5_vds.h5
diff --git a/tools/testfiles/vds/tvds-1.ddl b/tools/testfiles/vds/tvds-1.ddl
new file mode 100644
index 0000000..47fd413
--- /dev/null
+++ b/tools/testfiles/vds/tvds-1.ddl
@@ -0,0 +1,100 @@
+HDF5 "1_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 5, 18, 8 ) / ( H5S_UNLIMITED, 18, 8 ) }
+      DATA {
+      (0,0,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,1,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,2,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,3,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,6,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,7,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,8,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,9,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,10,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,11,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,12,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,13,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,14,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,15,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,16,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,17,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (1,0,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,1,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,2,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,3,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,6,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,7,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,8,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,9,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,10,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,11,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,12,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,13,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,14,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,15,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,16,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,17,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (2,0,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,1,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,2,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,3,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,6,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,7,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,8,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,9,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,10,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,11,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,12,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,13,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,14,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,15,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,16,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,17,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (3,0,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,1,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,2,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,3,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,6,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,7,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,8,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,9,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,10,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,11,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,12,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,13,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,14,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,15,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,16,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,17,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (4,0,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,1,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,2,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,3,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,6,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,7,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,8,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,9,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,10,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,11,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,12,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,13,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,14,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,15,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,16,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,17,0): 64, 64, 64, 64, 64, 64, 64, 64
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds-1.ls b/tools/testfiles/vds/tvds-1.ls
new file mode 100644
index 0000000..61c9e46
--- /dev/null
+++ b/tools/testfiles/vds/tvds-1.ls
@@ -0,0 +1,14 @@
+Opened "1_vds.h5" with sec2 driver.
+vds_dset                 Dataset {5/Inf, 18/18, 8/8}
+    Location:  1:800
+    Links:     1
+    Maps:      {6} Source {
+                      1_a.h5   /source_dset
+                      1_b.h5   /source_dset
+                      1_c.h5   /source_dset
+                      1_d.h5   /source_dset
+                      1_e.h5   /source_dset
+                      1_f.h5   /source_dset
+               }
+    Storage:   2880 logical bytes, 0 allocated bytes
+    Type:      32-bit little-endian integer
diff --git a/tools/testfiles/vds/tvds-2.ddl b/tools/testfiles/vds/tvds-2.ddl
new file mode 100644
index 0000000..5f2ae16
--- /dev/null
+++ b/tools/testfiles/vds/tvds-2.ddl
@@ -0,0 +1,58 @@
+HDF5 "2_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 6, 8, 14 ) / ( H5S_UNLIMITED, 8, 14 ) }
+      DATA {
+      (0,0,0): 10, 10, 10, 10, 10, 10, 10, 40, 40, 40, 40, 40, 40, 40,
+      (0,1,0): 10, 10, 10, 10, 10, 10, 10, 40, 40, 40, 40, 40, 40, 40,
+      (0,2,0): 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40,
+      (0,3,0): 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, 50, 50, 50, 50, 50, 50, 50,
+      (0,6,0): 30, 30, 30, 30, 30, 30, 30, 50, 50, 50, 50, 50, 50, 50,
+      (0,7,0): 30, 30, 30, 30, 30, 30, 30, 50, 50, 50, 50, 50, 50, 50,
+      (1,0,0): 11, 11, 11, 11, 11, 11, 11, 41, 41, 41, 41, 41, 41, 41,
+      (1,1,0): 11, 11, 11, 11, 11, 11, 11, 41, 41, 41, 41, 41, 41, 41,
+      (1,2,0): 21, 21, 21, 21, 21, 21, 21, 41, 41, 41, 41, 41, 41, 41,
+      (1,3,0): 21, 21, 21, 21, 21, 21, 21, 41, 41, 41, 41, 41, 41, 41,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, 41, 41, 41, 41, 41, 41, 41,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, 51, 51, 51, 51, 51, 51, 51,
+      (1,6,0): 31, 31, 31, 31, 31, 31, 31, 51, 51, 51, 51, 51, 51, 51,
+      (1,7,0): 31, 31, 31, 31, 31, 31, 31, 51, 51, 51, 51, 51, 51, 51,
+      (2,0,0): 12, 12, 12, 12, 12, 12, 12, 42, 42, 42, 42, 42, 42, 42,
+      (2,1,0): 12, 12, 12, 12, 12, 12, 12, 42, 42, 42, 42, 42, 42, 42,
+      (2,2,0): 22, 22, 22, 22, 22, 22, 22, 42, 42, 42, 42, 42, 42, 42,
+      (2,3,0): 22, 22, 22, 22, 22, 22, 22, 42, 42, 42, 42, 42, 42, 42,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, 42, 42, 42, 42, 42, 42, 42,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, 52, 52, 52, 52, 52, 52, 52,
+      (2,6,0): 32, 32, 32, 32, 32, 32, 32, 52, 52, 52, 52, 52, 52, 52,
+      (2,7,0): 32, 32, 32, 32, 32, 32, 32, 52, 52, 52, 52, 52, 52, 52,
+      (3,0,0): 13, 13, 13, 13, 13, 13, 13, 43, 43, 43, 43, 43, 43, 43,
+      (3,1,0): 13, 13, 13, 13, 13, 13, 13, 43, 43, 43, 43, 43, 43, 43,
+      (3,2,0): 23, 23, 23, 23, 23, 23, 23, 43, 43, 43, 43, 43, 43, 43,
+      (3,3,0): 23, 23, 23, 23, 23, 23, 23, 43, 43, 43, 43, 43, 43, 43,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, 43, 43, 43, 43, 43, 43, 43,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, 53, 53, 53, 53, 53, 53, 53,
+      (3,6,0): 33, 33, 33, 33, 33, 33, 33, 53, 53, 53, 53, 53, 53, 53,
+      (3,7,0): 33, 33, 33, 33, 33, 33, 33, 53, 53, 53, 53, 53, 53, 53,
+      (4,0,0): 14, 14, 14, 14, 14, 14, 14, 44, 44, 44, 44, 44, 44, 44,
+      (4,1,0): 14, 14, 14, 14, 14, 14, 14, 44, 44, 44, 44, 44, 44, 44,
+      (4,2,0): 24, 24, 24, 24, 24, 24, 24, 44, 44, 44, 44, 44, 44, 44,
+      (4,3,0): 24, 24, 24, 24, 24, 24, 24, 44, 44, 44, 44, 44, 44, 44,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, 44, 44, 44, 44, 44, 44, 44,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, 54, 54, 54, 54, 54, 54, 54,
+      (4,6,0): 34, 34, 34, 34, 34, 34, 34, 54, 54, 54, 54, 54, 54, 54,
+      (4,7,0): 34, 34, 34, 34, 34, 34, 34, 54, 54, 54, 54, 54, 54, 54,
+      (5,0,0): 15, 15, 15, 15, 15, 15, 15, 45, 45, 45, 45, 45, 45, 45,
+      (5,1,0): 15, 15, 15, 15, 15, 15, 15, 45, 45, 45, 45, 45, 45, 45,
+      (5,2,0): 25, 25, 25, 25, 25, 25, 25, 45, 45, 45, 45, 45, 45, 45,
+      (5,3,0): 25, 25, 25, 25, 25, 25, 25, 45, 45, 45, 45, 45, 45, 45,
+      (5,4,0): 25, 25, 25, 25, 25, 25, 25, 45, 45, 45, 45, 45, 45, 45,
+      (5,5,0): 25, 25, 25, 25, 25, 25, 25, 55, 55, 55, 55, 55, 55, 55,
+      (5,6,0): 35, 35, 35, 35, 35, 35, 35, 55, 55, 55, 55, 55, 55, 55,
+      (5,7,0): 35, 35, 35, 35, 35, 35, 35, 55, 55, 55, 55, 55, 55, 55
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds-2.ls b/tools/testfiles/vds/tvds-2.ls
new file mode 100644
index 0000000..49fe05f
--- /dev/null
+++ b/tools/testfiles/vds/tvds-2.ls
@@ -0,0 +1,13 @@
+Opened "2_vds.h5" with sec2 driver.
+vds_dset                 Dataset {6/Inf, 8/8, 14/14}
+    Location:  1:800
+    Links:     1
+    Maps:      {5} Source {
+                      2_a.h5   /source_dset
+                      2_b.h5   /source_dset
+                      2_c.h5   /source_dset
+                      2_d.h5   /source_dset
+                      2_e.h5   /source_dset
+               }
+    Storage:   2688 logical bytes, 0 allocated bytes
+    Type:      32-bit little-endian integer
diff --git a/tools/testfiles/vds/tvds-3_1.ddl b/tools/testfiles/vds/tvds-3_1.ddl
new file mode 100644
index 0000000..7d7d8b6
--- /dev/null
+++ b/tools/testfiles/vds/tvds-3_1.ddl
@@ -0,0 +1,135 @@
+HDF5 "3_1_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 5, 25, 8 ) / ( H5S_UNLIMITED, 25, 8 ) }
+      DATA {
+      (0,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,1,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,2,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,6,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,7,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,9,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,10,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,12,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,13,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,14,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,15,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,17,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,18,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,20,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,21,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,22,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,23,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,1,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,2,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,6,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,7,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,9,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,10,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,12,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,13,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,14,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,15,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,17,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,18,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,20,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,21,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,22,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,23,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,1,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,2,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,6,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,7,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,9,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,10,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,12,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,13,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,14,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,15,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,17,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,18,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,20,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,21,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,22,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,23,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,1,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,2,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,6,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,7,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,9,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,10,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,12,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,13,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,14,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,15,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,17,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,18,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,20,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,21,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,22,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,23,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,1,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,2,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,6,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,7,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,9,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,10,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,12,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,13,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,14,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,15,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,17,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,18,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,20,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,21,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,22,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,23,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,24,0): -9, -9, -9, -9, -9, -9, -9, -9
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds-3_1.ls b/tools/testfiles/vds/tvds-3_1.ls
new file mode 100644
index 0000000..fe24002
--- /dev/null
+++ b/tools/testfiles/vds/tvds-3_1.ls
@@ -0,0 +1,14 @@
+Opened "3_1_vds.h5" with sec2 driver.
+vds_dset                 Dataset {5/Inf, 25/25, 8/8}
+    Location:  1:800
+    Links:     1
+    Maps:      {6} Source {
+                      1_a.h5   /source_dset
+                      1_b.h5   /source_dset
+                      1_c.h5   /source_dset
+                      1_d.h5   /source_dset
+                      1_e.h5   /source_dset
+                      1_f.h5   /source_dset
+               }
+    Storage:   4000 logical bytes, 0 allocated bytes
+    Type:      32-bit little-endian integer
diff --git a/tools/testfiles/vds/tvds-3_2.ddl b/tools/testfiles/vds/tvds-3_2.ddl
new file mode 100644
index 0000000..baec6f0
--- /dev/null
+++ b/tools/testfiles/vds/tvds-3_2.ddl
@@ -0,0 +1,166 @@
+HDF5 "3_2_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 6, 13, 19 ) / ( H5S_UNLIMITED, 13, 19 ) }
+      DATA {
+      (0,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,0,15): -9, -9, -9, -9,
+      (0,1,0): -9, 10, 10, 10, 10, 10, 10, 10, -9, 40, 40, 40, 40, 40, 40,
+      (0,1,15): 40, -9, -9, -9,
+      (0,2,0): -9, 10, 10, 10, 10, 10, 10, 10, -9, 40, 40, 40, 40, 40, 40,
+      (0,2,15): 40, -9, -9, -9,
+      (0,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 40, 40, 40, 40, 40, 40,
+      (0,3,15): 40, -9, -9, -9,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, 40, 40, 40, 40, 40, 40,
+      (0,4,15): 40, -9, -9, -9,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, 40, 40, 40, 40, 40, 40,
+      (0,5,15): 40, -9, -9, -9,
+      (0,6,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,6,15): -9, -9, -9, -9,
+      (0,7,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,7,15): -9, -9, -9, -9,
+      (0,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 50, 50, 50,
+      (0,8,15): 50, 50, 50, 50,
+      (0,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 50, 50, 50,
+      (0,9,15): 50, 50, 50, 50,
+      (0,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 50, 50, 50,
+      (0,10,15): 50, 50, 50, 50,
+      (0,11,0): -9, -9, -9, -9, 30, 30, 30, 30, 30, 30, 30, -9, -9, -9, -9,
+      (0,11,15): -9, -9, -9, -9,
+      (0,12,0): -9, -9, -9, -9, 30, 30, 30, 30, 30, 30, 30, -9, -9, -9, -9,
+      (0,12,15): -9, -9, -9, -9,
+      (1,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,0,15): -9, -9, -9, -9,
+      (1,1,0): -9, 11, 11, 11, 11, 11, 11, 11, -9, 41, 41, 41, 41, 41, 41,
+      (1,1,15): 41, -9, -9, -9,
+      (1,2,0): -9, 11, 11, 11, 11, 11, 11, 11, -9, 41, 41, 41, 41, 41, 41,
+      (1,2,15): 41, -9, -9, -9,
+      (1,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 41, 41, 41, 41, 41, 41,
+      (1,3,15): 41, -9, -9, -9,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, 41, 41, 41, 41, 41, 41,
+      (1,4,15): 41, -9, -9, -9,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, 41, 41, 41, 41, 41, 41,
+      (1,5,15): 41, -9, -9, -9,
+      (1,6,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,6,15): -9, -9, -9, -9,
+      (1,7,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,7,15): -9, -9, -9, -9,
+      (1,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 51, 51, 51,
+      (1,8,15): 51, 51, 51, 51,
+      (1,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 51, 51, 51,
+      (1,9,15): 51, 51, 51, 51,
+      (1,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 51, 51, 51,
+      (1,10,15): 51, 51, 51, 51,
+      (1,11,0): -9, -9, -9, -9, 31, 31, 31, 31, 31, 31, 31, -9, -9, -9, -9,
+      (1,11,15): -9, -9, -9, -9,
+      (1,12,0): -9, -9, -9, -9, 31, 31, 31, 31, 31, 31, 31, -9, -9, -9, -9,
+      (1,12,15): -9, -9, -9, -9,
+      (2,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,0,15): -9, -9, -9, -9,
+      (2,1,0): -9, 12, 12, 12, 12, 12, 12, 12, -9, 42, 42, 42, 42, 42, 42,
+      (2,1,15): 42, -9, -9, -9,
+      (2,2,0): -9, 12, 12, 12, 12, 12, 12, 12, -9, 42, 42, 42, 42, 42, 42,
+      (2,2,15): 42, -9, -9, -9,
+      (2,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 42, 42, 42, 42, 42, 42,
+      (2,3,15): 42, -9, -9, -9,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, 42, 42, 42, 42, 42, 42,
+      (2,4,15): 42, -9, -9, -9,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, 42, 42, 42, 42, 42, 42,
+      (2,5,15): 42, -9, -9, -9,
+      (2,6,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,6,15): -9, -9, -9, -9,
+      (2,7,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,7,15): -9, -9, -9, -9,
+      (2,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 52, 52, 52,
+      (2,8,15): 52, 52, 52, 52,
+      (2,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 52, 52, 52,
+      (2,9,15): 52, 52, 52, 52,
+      (2,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 52, 52, 52,
+      (2,10,15): 52, 52, 52, 52,
+      (2,11,0): -9, -9, -9, -9, 32, 32, 32, 32, 32, 32, 32, -9, -9, -9, -9,
+      (2,11,15): -9, -9, -9, -9,
+      (2,12,0): -9, -9, -9, -9, 32, 32, 32, 32, 32, 32, 32, -9, -9, -9, -9,
+      (2,12,15): -9, -9, -9, -9,
+      (3,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,0,15): -9, -9, -9, -9,
+      (3,1,0): -9, 13, 13, 13, 13, 13, 13, 13, -9, 43, 43, 43, 43, 43, 43,
+      (3,1,15): 43, -9, -9, -9,
+      (3,2,0): -9, 13, 13, 13, 13, 13, 13, 13, -9, 43, 43, 43, 43, 43, 43,
+      (3,2,15): 43, -9, -9, -9,
+      (3,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 43, 43, 43, 43, 43, 43,
+      (3,3,15): 43, -9, -9, -9,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, 43, 43, 43, 43, 43, 43,
+      (3,4,15): 43, -9, -9, -9,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, 43, 43, 43, 43, 43, 43,
+      (3,5,15): 43, -9, -9, -9,
+      (3,6,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,6,15): -9, -9, -9, -9,
+      (3,7,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,7,15): -9, -9, -9, -9,
+      (3,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 53, 53, 53,
+      (3,8,15): 53, 53, 53, 53,
+      (3,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 53, 53, 53,
+      (3,9,15): 53, 53, 53, 53,
+      (3,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 53, 53, 53,
+      (3,10,15): 53, 53, 53, 53,
+      (3,11,0): -9, -9, -9, -9, 33, 33, 33, 33, 33, 33, 33, -9, -9, -9, -9,
+      (3,11,15): -9, -9, -9, -9,
+      (3,12,0): -9, -9, -9, -9, 33, 33, 33, 33, 33, 33, 33, -9, -9, -9, -9,
+      (3,12,15): -9, -9, -9, -9,
+      (4,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,0,15): -9, -9, -9, -9,
+      (4,1,0): -9, 14, 14, 14, 14, 14, 14, 14, -9, 44, 44, 44, 44, 44, 44,
+      (4,1,15): 44, -9, -9, -9,
+      (4,2,0): -9, 14, 14, 14, 14, 14, 14, 14, -9, 44, 44, 44, 44, 44, 44,
+      (4,2,15): 44, -9, -9, -9,
+      (4,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 44, 44, 44, 44, 44, 44,
+      (4,3,15): 44, -9, -9, -9,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, 44, 44, 44, 44, 44, 44,
+      (4,4,15): 44, -9, -9, -9,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, 44, 44, 44, 44, 44, 44,
+      (4,5,15): 44, -9, -9, -9,
+      (4,6,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,6,15): -9, -9, -9, -9,
+      (4,7,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,7,15): -9, -9, -9, -9,
+      (4,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 54, 54, 54,
+      (4,8,15): 54, 54, 54, 54,
+      (4,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 54, 54, 54,
+      (4,9,15): 54, 54, 54, 54,
+      (4,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 54, 54, 54,
+      (4,10,15): 54, 54, 54, 54,
+      (4,11,0): -9, -9, -9, -9, 34, 34, 34, 34, 34, 34, 34, -9, -9, -9, -9,
+      (4,11,15): -9, -9, -9, -9,
+      (4,12,0): -9, -9, -9, -9, 34, 34, 34, 34, 34, 34, 34, -9, -9, -9, -9,
+      (4,12,15): -9, -9, -9, -9,
+      (5,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (5,0,15): -9, -9, -9, -9,
+      (5,1,0): -9, 15, 15, 15, 15, 15, 15, 15, -9, 45, 45, 45, 45, 45, 45,
+      (5,1,15): 45, -9, -9, -9,
+      (5,2,0): -9, 15, 15, 15, 15, 15, 15, 15, -9, 45, 45, 45, 45, 45, 45,
+      (5,2,15): 45, -9, -9, -9,
+      (5,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 45, 45, 45, 45, 45, 45,
+      (5,3,15): 45, -9, -9, -9,
+      (5,4,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, 45, 45, 45, 45, 45, 45,
+      (5,4,15): 45, -9, -9, -9,
+      (5,5,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, 45, 45, 45, 45, 45, 45,
+      (5,5,15): 45, -9, -9, -9,
+      (5,6,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, -9, -9, -9, -9, -9, -9,
+      (5,6,15): -9, -9, -9, -9,
+      (5,7,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, -9, -9, -9, -9, -9, -9,
+      (5,7,15): -9, -9, -9, -9,
+      (5,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 55, 55, 55,
+      (5,8,15): 55, 55, 55, 55,
+      (5,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 55, 55, 55,
+      (5,9,15): 55, 55, 55, 55,
+      (5,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 55, 55, 55,
+      (5,10,15): 55, 55, 55, 55,
+      (5,11,0): -9, -9, -9, -9, 35, 35, 35, 35, 35, 35, 35, -9, -9, -9, -9,
+      (5,11,15): -9, -9, -9, -9,
+      (5,12,0): -9, -9, -9, -9, 35, 35, 35, 35, 35, 35, 35, -9, -9, -9, -9,
+      (5,12,15): -9, -9, -9, -9
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds-3_2.ls b/tools/testfiles/vds/tvds-3_2.ls
new file mode 100644
index 0000000..a4ad84f
--- /dev/null
+++ b/tools/testfiles/vds/tvds-3_2.ls
@@ -0,0 +1,13 @@
+Opened "3_2_vds.h5" with sec2 driver.
+vds_dset                 Dataset {6/Inf, 13/13, 19/19}
+    Location:  1:800
+    Links:     1
+    Maps:      {5} Source {
+                      2_a.h5   /source_dset
+                      2_b.h5   /source_dset
+                      2_c.h5   /source_dset
+                      2_d.h5   /source_dset
+                      2_e.h5   /source_dset
+               }
+    Storage:   5928 logical bytes, 0 allocated bytes
+    Type:      32-bit little-endian integer
diff --git a/tools/testfiles/vds/tvds-4.ddl b/tools/testfiles/vds/tvds-4.ddl
new file mode 100644
index 0000000..1832724
--- /dev/null
+++ b/tools/testfiles/vds/tvds-4.ddl
@@ -0,0 +1,46 @@
+HDF5 "4_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 9, 4, 4 ) / ( H5S_UNLIMITED, 4, 4 ) }
+      DATA {
+      (0,0,0): 10, 10, 10, 10,
+      (0,1,0): 10, 10, 10, 10,
+      (0,2,0): 10, 10, 10, 10,
+      (0,3,0): 10, 10, 10, 10,
+      (1,0,0): 11, 11, 11, 11,
+      (1,1,0): 11, 11, 11, 11,
+      (1,2,0): 11, 11, 11, 11,
+      (1,3,0): 11, 11, 11, 11,
+      (2,0,0): 12, 12, 12, 12,
+      (2,1,0): 12, 12, 12, 12,
+      (2,2,0): 12, 12, 12, 12,
+      (2,3,0): 12, 12, 12, 12,
+      (3,0,0): 20, 20, 20, 20,
+      (3,1,0): 20, 20, 20, 20,
+      (3,2,0): 20, 20, 20, 20,
+      (3,3,0): 20, 20, 20, 20,
+      (4,0,0): 21, 21, 21, 21,
+      (4,1,0): 21, 21, 21, 21,
+      (4,2,0): 21, 21, 21, 21,
+      (4,3,0): 21, 21, 21, 21,
+      (5,0,0): 22, 22, 22, 22,
+      (5,1,0): 22, 22, 22, 22,
+      (5,2,0): 22, 22, 22, 22,
+      (5,3,0): 22, 22, 22, 22,
+      (6,0,0): 30, 30, 30, 30,
+      (6,1,0): 30, 30, 30, 30,
+      (6,2,0): 30, 30, 30, 30,
+      (6,3,0): 30, 30, 30, 30,
+      (7,0,0): 31, 31, 31, 31,
+      (7,1,0): 31, 31, 31, 31,
+      (7,2,0): 31, 31, 31, 31,
+      (7,3,0): 31, 31, 31, 31,
+      (8,0,0): 32, 32, 32, 32,
+      (8,1,0): 32, 32, 32, 32,
+      (8,2,0): 32, 32, 32, 32,
+      (8,3,0): 32, 32, 32, 32
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds-4.ls b/tools/testfiles/vds/tvds-4.ls
new file mode 100644
index 0000000..176529b
--- /dev/null
+++ b/tools/testfiles/vds/tvds-4.ls
@@ -0,0 +1,9 @@
+Opened "4_vds.h5" with sec2 driver.
+vds_dset                 Dataset {9/Inf, 4/4, 4/4}
+    Location:  1:800
+    Links:     1
+    Maps:      {1} Source {
+                      4_%b.h5   /source_dset
+               }
+    Storage:   576 logical bytes, 0 allocated bytes
+    Type:      32-bit little-endian integer
diff --git a/tools/testfiles/vds/tvds-5.ddl b/tools/testfiles/vds/tvds-5.ddl
new file mode 100644
index 0000000..f59017b
--- /dev/null
+++ b/tools/testfiles/vds/tvds-5.ddl
@@ -0,0 +1,46 @@
+HDF5 "5_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 9, 4, 4 ) / ( H5S_UNLIMITED, 4, 4 ) }
+      DATA {
+      (0,0,0): 10, 10, 10, 10,
+      (0,1,0): 10, 10, 10, 10,
+      (0,2,0): 10, 10, 10, 10,
+      (0,3,0): 10, 10, 10, 10,
+      (1,0,0): 20, 20, 20, 20,
+      (1,1,0): 20, 20, 20, 20,
+      (1,2,0): 20, 20, 20, 20,
+      (1,3,0): 20, 20, 20, 20,
+      (2,0,0): 30, 30, 30, 30,
+      (2,1,0): 30, 30, 30, 30,
+      (2,2,0): 30, 30, 30, 30,
+      (2,3,0): 30, 30, 30, 30,
+      (3,0,0): 11, 11, 11, 11,
+      (3,1,0): 11, 11, 11, 11,
+      (3,2,0): 11, 11, 11, 11,
+      (3,3,0): 11, 11, 11, 11,
+      (4,0,0): 21, 21, 21, 21,
+      (4,1,0): 21, 21, 21, 21,
+      (4,2,0): 21, 21, 21, 21,
+      (4,3,0): 21, 21, 21, 21,
+      (5,0,0): 31, 31, 31, 31,
+      (5,1,0): 31, 31, 31, 31,
+      (5,2,0): 31, 31, 31, 31,
+      (5,3,0): 31, 31, 31, 31,
+      (6,0,0): 12, 12, 12, 12,
+      (6,1,0): 12, 12, 12, 12,
+      (6,2,0): 12, 12, 12, 12,
+      (6,3,0): 12, 12, 12, 12,
+      (7,0,0): 22, 22, 22, 22,
+      (7,1,0): 22, 22, 22, 22,
+      (7,2,0): 22, 22, 22, 22,
+      (7,3,0): 22, 22, 22, 22,
+      (8,0,0): 32, 32, 32, 32,
+      (8,1,0): 32, 32, 32, 32,
+      (8,2,0): 32, 32, 32, 32,
+      (8,3,0): 32, 32, 32, 32
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds-5.ls b/tools/testfiles/vds/tvds-5.ls
new file mode 100644
index 0000000..5f98e84
--- /dev/null
+++ b/tools/testfiles/vds/tvds-5.ls
@@ -0,0 +1,11 @@
+Opened "5_vds.h5" with sec2 driver.
+vds_dset                 Dataset {9/Inf, 4/4, 4/4}
+    Location:  1:800
+    Links:     1
+    Maps:      {3} Source {
+                      5_a.h5   /source_dset
+                      5_b.h5   /source_dset
+                      5_c.h5   /source_dset
+               }
+    Storage:   576 logical bytes, 0 allocated bytes
+    Type:      32-bit little-endian integer
diff --git a/tools/testfiles/vds/tvds_layout-1.ddl b/tools/testfiles/vds/tvds_layout-1.ddl
new file mode 100644
index 0000000..5d8a62c
--- /dev/null
+++ b/tools/testfiles/vds/tvds_layout-1.ddl
@@ -0,0 +1,232 @@
+HDF5 "1_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 5, 18, 8 ) / ( H5S_UNLIMITED, 18, 8 ) }
+      STORAGE_LAYOUT {
+         MAPPING 0 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+            SOURCE {
+               FILE "1_a.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+         }
+         MAPPING 1 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,2,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+            SOURCE {
+               FILE "1_b.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+         }
+         MAPPING 2 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,6,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+            SOURCE {
+               FILE "1_c.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+         }
+         MAPPING 3 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,8,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+            SOURCE {
+               FILE "1_d.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+         }
+         MAPPING 4 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,12,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+            SOURCE {
+               FILE "1_e.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+         }
+         MAPPING 5 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,14,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+            SOURCE {
+               FILE "1_f.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+         }
+      }
+      FILTERS {
+         NONE
+      }
+      FILLVALUE {
+         FILL_TIME H5D_FILL_TIME_IFSET
+         VALUE  -9
+      }
+      ALLOCATION_TIME {
+         H5D_ALLOC_TIME_INCR
+      }
+      DATA {
+      (0,0,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,1,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,2,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,3,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,6,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,7,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,8,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,9,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,10,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,11,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,12,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,13,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,14,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,15,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,16,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,17,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (1,0,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,1,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,2,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,3,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,6,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,7,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,8,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,9,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,10,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,11,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,12,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,13,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,14,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,15,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,16,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,17,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (2,0,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,1,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,2,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,3,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,6,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,7,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,8,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,9,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,10,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,11,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,12,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,13,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,14,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,15,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,16,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,17,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (3,0,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,1,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,2,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,3,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,6,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,7,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,8,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,9,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,10,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,11,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,12,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,13,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,14,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,15,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,16,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,17,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (4,0,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,1,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,2,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,3,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,6,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,7,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,8,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,9,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,10,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,11,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,12,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,13,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,14,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,15,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,16,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,17,0): 64, 64, 64, 64, 64, 64, 64, 64
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds_layout-2.ddl b/tools/testfiles/vds/tvds_layout-2.ddl
new file mode 100644
index 0000000..af6b718
--- /dev/null
+++ b/tools/testfiles/vds/tvds_layout-2.ddl
@@ -0,0 +1,170 @@
+HDF5 "2_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 6, 8, 14 ) / ( H5S_UNLIMITED, 8, 14 ) }
+      STORAGE_LAYOUT {
+         MAPPING 0 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+            SOURCE {
+               FILE "2_a.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+         }
+         MAPPING 1 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,2,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,7)
+               }
+            }
+            SOURCE {
+               FILE "2_b.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,7)
+               }
+            }
+         }
+         MAPPING 2 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,6,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+            SOURCE {
+               FILE "2_c.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+         }
+         MAPPING 3 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,7)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,5,7)
+               }
+            }
+            SOURCE {
+               FILE "2_d.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,5,7)
+               }
+            }
+         }
+         MAPPING 4 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,5,7)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,3,7)
+               }
+            }
+            SOURCE {
+               FILE "2_e.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,3,7)
+               }
+            }
+         }
+      }
+      FILTERS {
+         NONE
+      }
+      FILLVALUE {
+         FILL_TIME H5D_FILL_TIME_IFSET
+         VALUE  -9
+      }
+      ALLOCATION_TIME {
+         H5D_ALLOC_TIME_INCR
+      }
+      DATA {
+      (0,0,0): 10, 10, 10, 10, 10, 10, 10, 40, 40, 40, 40, 40, 40, 40,
+      (0,1,0): 10, 10, 10, 10, 10, 10, 10, 40, 40, 40, 40, 40, 40, 40,
+      (0,2,0): 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40,
+      (0,3,0): 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 40, 40,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, 50, 50, 50, 50, 50, 50, 50,
+      (0,6,0): 30, 30, 30, 30, 30, 30, 30, 50, 50, 50, 50, 50, 50, 50,
+      (0,7,0): 30, 30, 30, 30, 30, 30, 30, 50, 50, 50, 50, 50, 50, 50,
+      (1,0,0): 11, 11, 11, 11, 11, 11, 11, 41, 41, 41, 41, 41, 41, 41,
+      (1,1,0): 11, 11, 11, 11, 11, 11, 11, 41, 41, 41, 41, 41, 41, 41,
+      (1,2,0): 21, 21, 21, 21, 21, 21, 21, 41, 41, 41, 41, 41, 41, 41,
+      (1,3,0): 21, 21, 21, 21, 21, 21, 21, 41, 41, 41, 41, 41, 41, 41,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, 41, 41, 41, 41, 41, 41, 41,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, 51, 51, 51, 51, 51, 51, 51,
+      (1,6,0): 31, 31, 31, 31, 31, 31, 31, 51, 51, 51, 51, 51, 51, 51,
+      (1,7,0): 31, 31, 31, 31, 31, 31, 31, 51, 51, 51, 51, 51, 51, 51,
+      (2,0,0): 12, 12, 12, 12, 12, 12, 12, 42, 42, 42, 42, 42, 42, 42,
+      (2,1,0): 12, 12, 12, 12, 12, 12, 12, 42, 42, 42, 42, 42, 42, 42,
+      (2,2,0): 22, 22, 22, 22, 22, 22, 22, 42, 42, 42, 42, 42, 42, 42,
+      (2,3,0): 22, 22, 22, 22, 22, 22, 22, 42, 42, 42, 42, 42, 42, 42,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, 42, 42, 42, 42, 42, 42, 42,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, 52, 52, 52, 52, 52, 52, 52,
+      (2,6,0): 32, 32, 32, 32, 32, 32, 32, 52, 52, 52, 52, 52, 52, 52,
+      (2,7,0): 32, 32, 32, 32, 32, 32, 32, 52, 52, 52, 52, 52, 52, 52,
+      (3,0,0): 13, 13, 13, 13, 13, 13, 13, 43, 43, 43, 43, 43, 43, 43,
+      (3,1,0): 13, 13, 13, 13, 13, 13, 13, 43, 43, 43, 43, 43, 43, 43,
+      (3,2,0): 23, 23, 23, 23, 23, 23, 23, 43, 43, 43, 43, 43, 43, 43,
+      (3,3,0): 23, 23, 23, 23, 23, 23, 23, 43, 43, 43, 43, 43, 43, 43,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, 43, 43, 43, 43, 43, 43, 43,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, 53, 53, 53, 53, 53, 53, 53,
+      (3,6,0): 33, 33, 33, 33, 33, 33, 33, 53, 53, 53, 53, 53, 53, 53,
+      (3,7,0): 33, 33, 33, 33, 33, 33, 33, 53, 53, 53, 53, 53, 53, 53,
+      (4,0,0): 14, 14, 14, 14, 14, 14, 14, 44, 44, 44, 44, 44, 44, 44,
+      (4,1,0): 14, 14, 14, 14, 14, 14, 14, 44, 44, 44, 44, 44, 44, 44,
+      (4,2,0): 24, 24, 24, 24, 24, 24, 24, 44, 44, 44, 44, 44, 44, 44,
+      (4,3,0): 24, 24, 24, 24, 24, 24, 24, 44, 44, 44, 44, 44, 44, 44,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, 44, 44, 44, 44, 44, 44, 44,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, 54, 54, 54, 54, 54, 54, 54,
+      (4,6,0): 34, 34, 34, 34, 34, 34, 34, 54, 54, 54, 54, 54, 54, 54,
+      (4,7,0): 34, 34, 34, 34, 34, 34, 34, 54, 54, 54, 54, 54, 54, 54,
+      (5,0,0): 15, 15, 15, 15, 15, 15, 15, 45, 45, 45, 45, 45, 45, 45,
+      (5,1,0): 15, 15, 15, 15, 15, 15, 15, 45, 45, 45, 45, 45, 45, 45,
+      (5,2,0): 25, 25, 25, 25, 25, 25, 25, 45, 45, 45, 45, 45, 45, 45,
+      (5,3,0): 25, 25, 25, 25, 25, 25, 25, 45, 45, 45, 45, 45, 45, 45,
+      (5,4,0): 25, 25, 25, 25, 25, 25, 25, 45, 45, 45, 45, 45, 45, 45,
+      (5,5,0): 25, 25, 25, 25, 25, 25, 25, 55, 55, 55, 55, 55, 55, 55,
+      (5,6,0): 35, 35, 35, 35, 35, 35, 35, 55, 55, 55, 55, 55, 55, 55,
+      (5,7,0): 35, 35, 35, 35, 35, 35, 35, 55, 55, 55, 55, 55, 55, 55
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds_layout-3_1.ddl b/tools/testfiles/vds/tvds_layout-3_1.ddl
new file mode 100644
index 0000000..968327d
--- /dev/null
+++ b/tools/testfiles/vds/tvds_layout-3_1.ddl
@@ -0,0 +1,267 @@
+HDF5 "3_1_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 5, 25, 8 ) / ( H5S_UNLIMITED, 25, 8 ) }
+      STORAGE_LAYOUT {
+         MAPPING 0 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,1,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+            SOURCE {
+               FILE "1_a.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+         }
+         MAPPING 1 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,4,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+            SOURCE {
+               FILE "1_b.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+         }
+         MAPPING 2 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,9,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+            SOURCE {
+               FILE "1_c.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+         }
+         MAPPING 3 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,12,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+            SOURCE {
+               FILE "1_d.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+         }
+         MAPPING 4 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,17,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+            SOURCE {
+               FILE "1_e.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,8)
+               }
+            }
+         }
+         MAPPING 5 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,20,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+            SOURCE {
+               FILE "1_f.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,8)
+               }
+            }
+         }
+      }
+      FILTERS {
+         NONE
+      }
+      FILLVALUE {
+         FILL_TIME H5D_FILL_TIME_IFSET
+         VALUE  -9
+      }
+      ALLOCATION_TIME {
+         H5D_ALLOC_TIME_INCR
+      }
+      DATA {
+      (0,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,1,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,2,0): 10, 10, 10, 10, 10, 10, 10, 10,
+      (0,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,6,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,7,0): 20, 20, 20, 20, 20, 20, 20, 20,
+      (0,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,9,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,10,0): 30, 30, 30, 30, 30, 30, 30, 30,
+      (0,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,12,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,13,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,14,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,15,0): 40, 40, 40, 40, 40, 40, 40, 40,
+      (0,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,17,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,18,0): 50, 50, 50, 50, 50, 50, 50, 50,
+      (0,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,20,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,21,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,22,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,23,0): 60, 60, 60, 60, 60, 60, 60, 60,
+      (0,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,1,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,2,0): 11, 11, 11, 11, 11, 11, 11, 11,
+      (1,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,6,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,7,0): 21, 21, 21, 21, 21, 21, 21, 21,
+      (1,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,9,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,10,0): 31, 31, 31, 31, 31, 31, 31, 31,
+      (1,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,12,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,13,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,14,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,15,0): 41, 41, 41, 41, 41, 41, 41, 41,
+      (1,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,17,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,18,0): 51, 51, 51, 51, 51, 51, 51, 51,
+      (1,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,20,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,21,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,22,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,23,0): 61, 61, 61, 61, 61, 61, 61, 61,
+      (1,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,1,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,2,0): 12, 12, 12, 12, 12, 12, 12, 12,
+      (2,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,6,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,7,0): 22, 22, 22, 22, 22, 22, 22, 22,
+      (2,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,9,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,10,0): 32, 32, 32, 32, 32, 32, 32, 32,
+      (2,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,12,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,13,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,14,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,15,0): 42, 42, 42, 42, 42, 42, 42, 42,
+      (2,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,17,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,18,0): 52, 52, 52, 52, 52, 52, 52, 52,
+      (2,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,20,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,21,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,22,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,23,0): 62, 62, 62, 62, 62, 62, 62, 62,
+      (2,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,1,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,2,0): 13, 13, 13, 13, 13, 13, 13, 13,
+      (3,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,6,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,7,0): 23, 23, 23, 23, 23, 23, 23, 23,
+      (3,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,9,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,10,0): 33, 33, 33, 33, 33, 33, 33, 33,
+      (3,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,12,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,13,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,14,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,15,0): 43, 43, 43, 43, 43, 43, 43, 43,
+      (3,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,17,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,18,0): 53, 53, 53, 53, 53, 53, 53, 53,
+      (3,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,20,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,21,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,22,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,23,0): 63, 63, 63, 63, 63, 63, 63, 63,
+      (3,24,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,0,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,1,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,2,0): 14, 14, 14, 14, 14, 14, 14, 14,
+      (4,3,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,6,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,7,0): 24, 24, 24, 24, 24, 24, 24, 24,
+      (4,8,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,9,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,10,0): 34, 34, 34, 34, 34, 34, 34, 34,
+      (4,11,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,12,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,13,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,14,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,15,0): 44, 44, 44, 44, 44, 44, 44, 44,
+      (4,16,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,17,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,18,0): 54, 54, 54, 54, 54, 54, 54, 54,
+      (4,19,0): -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,20,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,21,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,22,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,23,0): 64, 64, 64, 64, 64, 64, 64, 64,
+      (4,24,0): -9, -9, -9, -9, -9, -9, -9, -9
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds_layout-3_2.ddl b/tools/testfiles/vds/tvds_layout-3_2.ddl
new file mode 100644
index 0000000..7e14ec2
--- /dev/null
+++ b/tools/testfiles/vds/tvds_layout-3_2.ddl
@@ -0,0 +1,278 @@
+HDF5 "3_2_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 6, 13, 19 ) / ( H5S_UNLIMITED, 13, 19 ) }
+      STORAGE_LAYOUT {
+         MAPPING 0 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,1,1)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+            SOURCE {
+               FILE "2_a.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+         }
+         MAPPING 1 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,4,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,7)
+               }
+            }
+            SOURCE {
+               FILE "2_b.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,7)
+               }
+            }
+         }
+         MAPPING 2 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,11,4)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+            SOURCE {
+               FILE "2_c.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,2,7)
+               }
+            }
+         }
+         MAPPING 3 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,1,9)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,5,7)
+               }
+            }
+            SOURCE {
+               FILE "2_d.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,5,7)
+               }
+            }
+         }
+         MAPPING 4 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,8,12)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,3,7)
+               }
+            }
+            SOURCE {
+               FILE "2_e.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,3,7)
+               }
+            }
+         }
+      }
+      FILTERS {
+         NONE
+      }
+      FILLVALUE {
+         FILL_TIME H5D_FILL_TIME_IFSET
+         VALUE  -9
+      }
+      ALLOCATION_TIME {
+         H5D_ALLOC_TIME_INCR
+      }
+      DATA {
+      (0,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,0,15): -9, -9, -9, -9,
+      (0,1,0): -9, 10, 10, 10, 10, 10, 10, 10, -9, 40, 40, 40, 40, 40, 40,
+      (0,1,15): 40, -9, -9, -9,
+      (0,2,0): -9, 10, 10, 10, 10, 10, 10, 10, -9, 40, 40, 40, 40, 40, 40,
+      (0,2,15): 40, -9, -9, -9,
+      (0,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 40, 40, 40, 40, 40, 40,
+      (0,3,15): 40, -9, -9, -9,
+      (0,4,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, 40, 40, 40, 40, 40, 40,
+      (0,4,15): 40, -9, -9, -9,
+      (0,5,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, 40, 40, 40, 40, 40, 40,
+      (0,5,15): 40, -9, -9, -9,
+      (0,6,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,6,15): -9, -9, -9, -9,
+      (0,7,0): 20, 20, 20, 20, 20, 20, 20, -9, -9, -9, -9, -9, -9, -9, -9,
+      (0,7,15): -9, -9, -9, -9,
+      (0,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 50, 50, 50,
+      (0,8,15): 50, 50, 50, 50,
+      (0,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 50, 50, 50,
+      (0,9,15): 50, 50, 50, 50,
+      (0,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 50, 50, 50,
+      (0,10,15): 50, 50, 50, 50,
+      (0,11,0): -9, -9, -9, -9, 30, 30, 30, 30, 30, 30, 30, -9, -9, -9, -9,
+      (0,11,15): -9, -9, -9, -9,
+      (0,12,0): -9, -9, -9, -9, 30, 30, 30, 30, 30, 30, 30, -9, -9, -9, -9,
+      (0,12,15): -9, -9, -9, -9,
+      (1,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,0,15): -9, -9, -9, -9,
+      (1,1,0): -9, 11, 11, 11, 11, 11, 11, 11, -9, 41, 41, 41, 41, 41, 41,
+      (1,1,15): 41, -9, -9, -9,
+      (1,2,0): -9, 11, 11, 11, 11, 11, 11, 11, -9, 41, 41, 41, 41, 41, 41,
+      (1,2,15): 41, -9, -9, -9,
+      (1,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 41, 41, 41, 41, 41, 41,
+      (1,3,15): 41, -9, -9, -9,
+      (1,4,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, 41, 41, 41, 41, 41, 41,
+      (1,4,15): 41, -9, -9, -9,
+      (1,5,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, 41, 41, 41, 41, 41, 41,
+      (1,5,15): 41, -9, -9, -9,
+      (1,6,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,6,15): -9, -9, -9, -9,
+      (1,7,0): 21, 21, 21, 21, 21, 21, 21, -9, -9, -9, -9, -9, -9, -9, -9,
+      (1,7,15): -9, -9, -9, -9,
+      (1,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 51, 51, 51,
+      (1,8,15): 51, 51, 51, 51,
+      (1,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 51, 51, 51,
+      (1,9,15): 51, 51, 51, 51,
+      (1,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 51, 51, 51,
+      (1,10,15): 51, 51, 51, 51,
+      (1,11,0): -9, -9, -9, -9, 31, 31, 31, 31, 31, 31, 31, -9, -9, -9, -9,
+      (1,11,15): -9, -9, -9, -9,
+      (1,12,0): -9, -9, -9, -9, 31, 31, 31, 31, 31, 31, 31, -9, -9, -9, -9,
+      (1,12,15): -9, -9, -9, -9,
+      (2,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,0,15): -9, -9, -9, -9,
+      (2,1,0): -9, 12, 12, 12, 12, 12, 12, 12, -9, 42, 42, 42, 42, 42, 42,
+      (2,1,15): 42, -9, -9, -9,
+      (2,2,0): -9, 12, 12, 12, 12, 12, 12, 12, -9, 42, 42, 42, 42, 42, 42,
+      (2,2,15): 42, -9, -9, -9,
+      (2,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 42, 42, 42, 42, 42, 42,
+      (2,3,15): 42, -9, -9, -9,
+      (2,4,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, 42, 42, 42, 42, 42, 42,
+      (2,4,15): 42, -9, -9, -9,
+      (2,5,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, 42, 42, 42, 42, 42, 42,
+      (2,5,15): 42, -9, -9, -9,
+      (2,6,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,6,15): -9, -9, -9, -9,
+      (2,7,0): 22, 22, 22, 22, 22, 22, 22, -9, -9, -9, -9, -9, -9, -9, -9,
+      (2,7,15): -9, -9, -9, -9,
+      (2,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 52, 52, 52,
+      (2,8,15): 52, 52, 52, 52,
+      (2,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 52, 52, 52,
+      (2,9,15): 52, 52, 52, 52,
+      (2,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 52, 52, 52,
+      (2,10,15): 52, 52, 52, 52,
+      (2,11,0): -9, -9, -9, -9, 32, 32, 32, 32, 32, 32, 32, -9, -9, -9, -9,
+      (2,11,15): -9, -9, -9, -9,
+      (2,12,0): -9, -9, -9, -9, 32, 32, 32, 32, 32, 32, 32, -9, -9, -9, -9,
+      (2,12,15): -9, -9, -9, -9,
+      (3,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,0,15): -9, -9, -9, -9,
+      (3,1,0): -9, 13, 13, 13, 13, 13, 13, 13, -9, 43, 43, 43, 43, 43, 43,
+      (3,1,15): 43, -9, -9, -9,
+      (3,2,0): -9, 13, 13, 13, 13, 13, 13, 13, -9, 43, 43, 43, 43, 43, 43,
+      (3,2,15): 43, -9, -9, -9,
+      (3,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 43, 43, 43, 43, 43, 43,
+      (3,3,15): 43, -9, -9, -9,
+      (3,4,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, 43, 43, 43, 43, 43, 43,
+      (3,4,15): 43, -9, -9, -9,
+      (3,5,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, 43, 43, 43, 43, 43, 43,
+      (3,5,15): 43, -9, -9, -9,
+      (3,6,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,6,15): -9, -9, -9, -9,
+      (3,7,0): 23, 23, 23, 23, 23, 23, 23, -9, -9, -9, -9, -9, -9, -9, -9,
+      (3,7,15): -9, -9, -9, -9,
+      (3,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 53, 53, 53,
+      (3,8,15): 53, 53, 53, 53,
+      (3,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 53, 53, 53,
+      (3,9,15): 53, 53, 53, 53,
+      (3,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 53, 53, 53,
+      (3,10,15): 53, 53, 53, 53,
+      (3,11,0): -9, -9, -9, -9, 33, 33, 33, 33, 33, 33, 33, -9, -9, -9, -9,
+      (3,11,15): -9, -9, -9, -9,
+      (3,12,0): -9, -9, -9, -9, 33, 33, 33, 33, 33, 33, 33, -9, -9, -9, -9,
+      (3,12,15): -9, -9, -9, -9,
+      (4,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,0,15): -9, -9, -9, -9,
+      (4,1,0): -9, 14, 14, 14, 14, 14, 14, 14, -9, 44, 44, 44, 44, 44, 44,
+      (4,1,15): 44, -9, -9, -9,
+      (4,2,0): -9, 14, 14, 14, 14, 14, 14, 14, -9, 44, 44, 44, 44, 44, 44,
+      (4,2,15): 44, -9, -9, -9,
+      (4,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 44, 44, 44, 44, 44, 44,
+      (4,3,15): 44, -9, -9, -9,
+      (4,4,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, 44, 44, 44, 44, 44, 44,
+      (4,4,15): 44, -9, -9, -9,
+      (4,5,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, 44, 44, 44, 44, 44, 44,
+      (4,5,15): 44, -9, -9, -9,
+      (4,6,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,6,15): -9, -9, -9, -9,
+      (4,7,0): 24, 24, 24, 24, 24, 24, 24, -9, -9, -9, -9, -9, -9, -9, -9,
+      (4,7,15): -9, -9, -9, -9,
+      (4,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 54, 54, 54,
+      (4,8,15): 54, 54, 54, 54,
+      (4,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 54, 54, 54,
+      (4,9,15): 54, 54, 54, 54,
+      (4,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 54, 54, 54,
+      (4,10,15): 54, 54, 54, 54,
+      (4,11,0): -9, -9, -9, -9, 34, 34, 34, 34, 34, 34, 34, -9, -9, -9, -9,
+      (4,11,15): -9, -9, -9, -9,
+      (4,12,0): -9, -9, -9, -9, 34, 34, 34, 34, 34, 34, 34, -9, -9, -9, -9,
+      (4,12,15): -9, -9, -9, -9,
+      (5,0,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
+      (5,0,15): -9, -9, -9, -9,
+      (5,1,0): -9, 15, 15, 15, 15, 15, 15, 15, -9, 45, 45, 45, 45, 45, 45,
+      (5,1,15): 45, -9, -9, -9,
+      (5,2,0): -9, 15, 15, 15, 15, 15, 15, 15, -9, 45, 45, 45, 45, 45, 45,
+      (5,2,15): 45, -9, -9, -9,
+      (5,3,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, 45, 45, 45, 45, 45, 45,
+      (5,3,15): 45, -9, -9, -9,
+      (5,4,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, 45, 45, 45, 45, 45, 45,
+      (5,4,15): 45, -9, -9, -9,
+      (5,5,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, 45, 45, 45, 45, 45, 45,
+      (5,5,15): 45, -9, -9, -9,
+      (5,6,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, -9, -9, -9, -9, -9, -9,
+      (5,6,15): -9, -9, -9, -9,
+      (5,7,0): 25, 25, 25, 25, 25, 25, 25, -9, -9, -9, -9, -9, -9, -9, -9,
+      (5,7,15): -9, -9, -9, -9,
+      (5,8,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 55, 55, 55,
+      (5,8,15): 55, 55, 55, 55,
+      (5,9,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 55, 55, 55,
+      (5,9,15): 55, 55, 55, 55,
+      (5,10,0): -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, 55, 55, 55,
+      (5,10,15): 55, 55, 55, 55,
+      (5,11,0): -9, -9, -9, -9, 35, 35, 35, 35, 35, 35, 35, -9, -9, -9, -9,
+      (5,11,15): -9, -9, -9, -9,
+      (5,12,0): -9, -9, -9, -9, 35, 35, 35, 35, 35, 35, 35, -9, -9, -9, -9,
+      (5,12,15): -9, -9, -9, -9
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds_layout-4.ddl b/tools/testfiles/vds/tvds_layout-4.ddl
new file mode 100644
index 0000000..018644e
--- /dev/null
+++ b/tools/testfiles/vds/tvds_layout-4.ddl
@@ -0,0 +1,78 @@
+HDF5 "4_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 9, 4, 4 ) / ( H5S_UNLIMITED, 4, 4 ) }
+      STORAGE_LAYOUT {
+         MAPPING 0 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (3,1,1)
+                  COUNT (H5S_UNLIMITED,1,1)
+                  BLOCK (3,4,4)
+               }
+            }
+            SOURCE {
+               FILE "4_%b.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (3,4,4)
+               }
+            }
+         }
+      }
+      FILTERS {
+         NONE
+      }
+      FILLVALUE {
+         FILL_TIME H5D_FILL_TIME_IFSET
+         VALUE  -9
+      }
+      ALLOCATION_TIME {
+         H5D_ALLOC_TIME_INCR
+      }
+      DATA {
+      (0,0,0): 10, 10, 10, 10,
+      (0,1,0): 10, 10, 10, 10,
+      (0,2,0): 10, 10, 10, 10,
+      (0,3,0): 10, 10, 10, 10,
+      (1,0,0): 11, 11, 11, 11,
+      (1,1,0): 11, 11, 11, 11,
+      (1,2,0): 11, 11, 11, 11,
+      (1,3,0): 11, 11, 11, 11,
+      (2,0,0): 12, 12, 12, 12,
+      (2,1,0): 12, 12, 12, 12,
+      (2,2,0): 12, 12, 12, 12,
+      (2,3,0): 12, 12, 12, 12,
+      (3,0,0): 20, 20, 20, 20,
+      (3,1,0): 20, 20, 20, 20,
+      (3,2,0): 20, 20, 20, 20,
+      (3,3,0): 20, 20, 20, 20,
+      (4,0,0): 21, 21, 21, 21,
+      (4,1,0): 21, 21, 21, 21,
+      (4,2,0): 21, 21, 21, 21,
+      (4,3,0): 21, 21, 21, 21,
+      (5,0,0): 22, 22, 22, 22,
+      (5,1,0): 22, 22, 22, 22,
+      (5,2,0): 22, 22, 22, 22,
+      (5,3,0): 22, 22, 22, 22,
+      (6,0,0): 30, 30, 30, 30,
+      (6,1,0): 30, 30, 30, 30,
+      (6,2,0): 30, 30, 30, 30,
+      (6,3,0): 30, 30, 30, 30,
+      (7,0,0): 31, 31, 31, 31,
+      (7,1,0): 31, 31, 31, 31,
+      (7,2,0): 31, 31, 31, 31,
+      (7,3,0): 31, 31, 31, 31,
+      (8,0,0): 32, 32, 32, 32,
+      (8,1,0): 32, 32, 32, 32,
+      (8,2,0): 32, 32, 32, 32,
+      (8,3,0): 32, 32, 32, 32
+      }
+   }
+}
+}
diff --git a/tools/testfiles/vds/tvds_layout-5.ddl b/tools/testfiles/vds/tvds_layout-5.ddl
new file mode 100644
index 0000000..b43629a
--- /dev/null
+++ b/tools/testfiles/vds/tvds_layout-5.ddl
@@ -0,0 +1,118 @@
+HDF5 "5_vds.h5" {
+GROUP "/" {
+   DATASET "vds_dset" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 9, 4, 4 ) / ( H5S_UNLIMITED, 4, 4 ) }
+      STORAGE_LAYOUT {
+         MAPPING 0 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (3,1,1)
+                  COUNT (H5S_UNLIMITED,1,1)
+                  BLOCK (1,4,4)
+               }
+            }
+            SOURCE {
+               FILE "5_a.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,4)
+               }
+            }
+         }
+         MAPPING 1 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (1,0,0)
+                  STRIDE (3,1,1)
+                  COUNT (H5S_UNLIMITED,1,1)
+                  BLOCK (1,4,4)
+               }
+            }
+            SOURCE {
+               FILE "5_b.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,4)
+               }
+            }
+         }
+         MAPPING 2 { 
+            VIRTUAL {
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (2,0,0)
+                  STRIDE (3,1,1)
+                  COUNT (H5S_UNLIMITED,1,1)
+                  BLOCK (1,4,4)
+               }
+            }
+            SOURCE {
+               FILE "5_c.h5"
+               DATASET "/source_dset"
+               SELECTION REGULAR_HYPERSLAB { 
+                  START (0,0,0)
+                  STRIDE (1,1,1)
+                  COUNT (1,1,1)
+                  BLOCK (H5S_UNLIMITED,4,4)
+               }
+            }
+         }
+      }
+      FILTERS {
+         NONE
+      }
+      FILLVALUE {
+         FILL_TIME H5D_FILL_TIME_IFSET
+         VALUE  -9
+      }
+      ALLOCATION_TIME {
+         H5D_ALLOC_TIME_INCR
+      }
+      DATA {
+      (0,0,0): 10, 10, 10, 10,
+      (0,1,0): 10, 10, 10, 10,
+      (0,2,0): 10, 10, 10, 10,
+      (0,3,0): 10, 10, 10, 10,
+      (1,0,0): 20, 20, 20, 20,
+      (1,1,0): 20, 20, 20, 20,
+      (1,2,0): 20, 20, 20, 20,
+      (1,3,0): 20, 20, 20, 20,
+      (2,0,0): 30, 30, 30, 30,
+      (2,1,0): 30, 30, 30, 30,
+      (2,2,0): 30, 30, 30, 30,
+      (2,3,0): 30, 30, 30, 30,
+      (3,0,0): 11, 11, 11, 11,
+      (3,1,0): 11, 11, 11, 11,
+      (3,2,0): 11, 11, 11, 11,
+      (3,3,0): 11, 11, 11, 11,
+      (4,0,0): 21, 21, 21, 21,
+      (4,1,0): 21, 21, 21, 21,
+      (4,2,0): 21, 21, 21, 21,
+      (4,3,0): 21, 21, 21, 21,
+      (5,0,0): 31, 31, 31, 31,
+      (5,1,0): 31, 31, 31, 31,
+      (5,2,0): 31, 31, 31, 31,
+      (5,3,0): 31, 31, 31, 31,
+      (6,0,0): 12, 12, 12, 12,
+      (6,1,0): 12, 12, 12, 12,
+      (6,2,0): 12, 12, 12, 12,
+      (6,3,0): 12, 12, 12, 12,
+      (7,0,0): 22, 22, 22, 22,
+      (7,1,0): 22, 22, 22, 22,
+      (7,2,0): 22, 22, 22, 22,
+      (7,3,0): 22, 22, 22, 22,
+      (8,0,0): 32, 32, 32, 32,
+      (8,1,0): 32, 32, 32, 32,
+      (8,2,0): 32, 32, 32, 32,
+      (8,3,0): 32, 32, 32, 32
+      }
+   }
+}
+}