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diff --git a/tools/test/misc/vds/UC_3.h b/tools/test/misc/vds/UC_3.h
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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}
+};
+
+/* 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 */
+