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authorFrank Baker <fbaker@hdfgroup.org>1999-04-16 19:48:19 (GMT)
committerFrank Baker <fbaker@hdfgroup.org>1999-04-16 19:48:19 (GMT)
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-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
-<html>
-<head>
- <title>DDL for HDF5</title>
-</head>
-
-<body>
-<h1>DDL in BNF for HDF5</h1>
-
-
-<h2>1. Introduction</h2>
-
-This document contains the data description language (DDL) for an HDF5 file.
-The description is in Backus-Naur Form.
-
-<h2>2. Explanation of Symbols</h2>
-
-This section contains a brief explanation of the symbols used in the DDL.
-
-<PRE>
- ::= defined as
- &lt;tname&gt; a token with the name tname
- &lt;a&gt; | &lt;b&gt; one of &lt;a&gt; or &lt;b&gt;
- &lt;a&gt;<FONT SIZE=1.7>opt</FONT> zero or one occurrence of &lt;a&gt;
- &lt;a&gt;* zero or more occurrence of &lt;a&gt;
- &lt;a&gt;+ one or more occurrence of &lt;a&gt;
- TBD To Be Decided
-</pre>
-
-<h2>3. The DDL</h2>
-
-<dir>
-<pre>
-&lt;file&gt; ::= HDF5 "&lt;file_name&gt;" { &lt;file_boot_block&gt;<FONT SIZE=1.7>opt</FONT> &lt;root_group&gt; }
-
-&lt;file_name&gt; ::= &lt;identifier&gt;
-
-&lt;file_boot_block&gt; ::= BOOT_BLOCK { &lt;boot_block_content&gt; }
-
-&lt;boot_block_content&gt; ::= TBD
-
-&lt;root_group&gt; ::= GROUP "/" { &lt;unamed_datatype&gt;* &lt;group_attribute&gt;* &lt;group_member&gt;* }
-
-&lt;unamed_datatype&gt ::= DATATYPE "&lt;unamed_type_name&gt;" { &lt;compound_type_def&gt;+ }
-
-&lt;unamed_type_name&gt; ::= the assigned name for unamed type is in the form of
- #oid1:oid2, where oid1 and oid2 are the object ids of the type
-
-&lt;compound_type_def&gt; ::= &lt;named_scalar_type&gt; | &lt;named_array_type&gt;
-
-&lt;named_scalar_type&gt; ::= &lt;scalar_type&gt; &lt;field_name&gt; ;
-
-&lt;scalar_type&gt; ::= H5T_STD_I8BE | H5T_STD_I8LE | ...
-
-&lt;field_name&gt; ::= &lt;identifier&gt;
-
-&lt;named_array_type&gt; ::= &lt;scalar_type&gt; &lt;field_name&gt; &lt;dim_sizes&gt; ;
-
-&lt;dim_sizes&gt; ::= dimension sizes in the form of [dimsize1][dimzise2]...,
- where dimsize1, dimsize2 are integers
-
-&lt;group_attribute&gt; ::= &lt;attribute&gt;
-
-&lt;attribute&gt; ::= ATTRIBUTE "&lt;attr_name&gt" { &lt;datatype&gt;
- &lt;dataspace&gt;
- &lt;data&gt;<FONT SIZE=1.7>opt</FONT> }
-// &lt;datatype&gt; and &lt;dataspace&gt; must appear before &lt;data&gt;.
-
-&lt;attr_name&gt; ::= &lt;identifier&gt;
-
-&lt;datatype&gt; ::= DATATYPE { &lt;named_type&gt; } |
- DATATYPE { "&lt;scalar_type&gt;" } |
- DATATYPE { &lt;compound_type_def&gt;+ }
-
-&lt;named_type&gt; ::= &lt;hardlink&gt;
-
-&lt;hardlink&gt; ::= HARDLINK { "&lt;abs_name&gt;" }
-
-&lt;abs_name&gt; ::= object absolute name
-
-&lt;dataspace&gt; ::= DATASPACE { "&lt;dataspace_name&gt;" } |
- DATASPACE { ARRAY &lt;current_dims&gt; &lt;max_dims&gt; } |
- DATASPACE { OTHER &lt;ds_definition&gt;+ }
-
-&lt;dataspace_name&gt; ::= &lt;identifier&gt;
-
-&lt;current_dims&gt; ::= a list of integers in the form of (<i>i<FONT SIZE=1.0>1</i></FONT>, <i>i<FONT SIZE=1.0>2</i></FONT>, ... ),
- where <i>i<FONT SIZE=1.0>k</i></FONT> is an integer, <i>k</i> = 1,2,...
-
-&lt;max_dims&gt; ::= (<i>i<FONT SIZE=1.0>1</i></FONT>, <i>i<FONT SIZE=1.0>2</i></FONT>, ... ) where <i>i<FONT SIZE=1.0>k</i></FONT> is an integer or H5S_UNLIMITED
-
-&lt;ds_definition&gt; ::= TBD
-
-&lt;data&gt; ::= data {TBD}
-
-&lt;group_member&gt; ::= &lt;named_datatype&gt; | &lt;named_dataspace&gt; | &lt;group&gt; | &lt;dataset&gt; |
- &lt;softlink&gt;
-
-&lt;named_datatype&gt; ::= DATATYPE "&lt;type_name&gt;" { &lt;compound_type_def&gt;+ }
-
-&lt;type_name&gt; ::= "&lt;identifier&gt;"
-
-&lt;named_dataspace&gt; ::= DATASPACE "&lt;dataspace_name&gt;" { ARRAY &lt;current_dims&gt; &lt;max_dims&gt; } |
- DATASPACE "&lt;dataspace_name&gt;" { OTHER &lt;ds_definition&gt;+ }
-
-&lt;group&gt; ::= GROUP "&lt;group_name&gt;" { &lt;hardlink&gt; } |
- GROUP "&lt;group_name&gt;" { &lt;group_attribute&gt;* &lt;group_member&gt;* }
-
-&lt;group_name&gt; ::= &lt;identifier&gt;
-
-&lt;dataset&gt; ::= DATASET "&lt;dataset_name&gt;" { &lt;hardlink&gt; } |
- DATASET "&lt;dataset_name&gt;" { &lt;datatype&gt;
- &lt;dataspace&gt;
- &lt;storagelayout&gt;<FONT SIZE=1.7>opt</FONT>
- &lt;compression&gt;<FONT SIZE=1.7>opt</FONT>
- &lt;dataset_attribute&gt;*
- &lt;data&gt;<FONT SIZE=1.7>opt</FONT> }
-// Tokens within {} can be in any order as long as &lt;data&gt; and &lt;dataset_attribute&gt;
-// are after &lt;datatype&gt; and &lt;dataspace&gt;.
-
-&lt;dataset_name&gt; ::= &lt;identifier&gt;
-
-&lt;storagelayout&gt; :: = STORAGELAYOUT &lt;contiguous_layout&gt; |
- STORAGELAYOUT &lt;chunked_layout&gt; |
- STORAGELAYOUT &lt;compact_layout&gt; |
- STORAGELAYOUT &lt;external_layout&gt;
-
-&lt;contiguous_layout&gt; ::= {CONTIGUOUS} // default
-
-&lt;chunked_layout&gt; ::= {CHUNKED &lt;dims&gt; }
-
-&lt;dims&gt; ::= (<i>i<FONT SIZE=1.0>1</i></FONT>, <i>i<FONT SIZE=1.0>2</i></FONT>, ... ), <i>i<FONT SIZE=1.0>k</i></FONT> is an integer, <i>k</i> = 1,2,...
-
-&lt;compact_layout&gt; ::= TBD
-
-&lt;external_layout&gt; ::= {EXTERNAL &lt;external_file&gt;+ }
-
-&lt;external_file&gt; ::= (&lt;file_name&gt; &lt;offset&gt; &lt;size&gt;)
-
-&lt;offset&gt; ::= an integer
-
-&lt;size&gt; ::= an integer
-
-&lt;compression&gt; :: = COMPRESSION { TBD }
-
-&lt;dataset_attribute&gt; ::= &lt;attribute&gt;
-
-&lt;softlink&gt; ::= SOFTLINK "&lt;softlink_name&gt;" { LINKTARGET "&lt;target&gt;" }
-
-&lt;softlink_name&gt; ::= &lt;identifier&gt;
-
-&lt;target&gt; ::= &lt;identifier&gt;
-
-&lt;identifier&gt; ::= string
-// character '/' should be used with care.
-
-</PRE>
-</dir>
-
-
-<h2>4. An Example of an HDF5 File in DDL</h2>
-
-<dir>
-<PRE>
-HDF5 "example.h5" {
-GROUP "/" {
- DATASET "dset1" {
- DATATYPE {
- H5T_STD_I32BE int_name;
- H5T_IEEE_F32BE float_name;
- H5T_IEEE_F64BE double_name;
- }
- DATASPACE { ARRAY ( 5 ) ( 5 ) }
- DATA {{0,0,1}, {1,1,0.5}, {2,4,0.333333}, {3,9,0.25}, {4,16,0.2}}
- }
- GROUP "group1" {
- DATASET "dset2" {
- DATATYPE {
- HARDLINK { "/type1" }
- }
- DATASPACE { ARRAY ( 5 ) ( 5 ) }
- DATA {{0,0}, {1,1.1}, {2,2.2}, {3,3.3}, {4,4.4}}
- }
- }
- GROUP "group2" {
- HARDLINK { "/group1" }
- }
- SOFTLINK "slink1" {
- LINKTARGET "somevalue"
- }
- DATATYPE "type1" {
- H5T_STD_I32BE int_name;
- H5T_IEEE_F32BE float_name;
- }
-}
-}
-</pre>
-</dir>
-
-<hr>
-<address>
-<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
-</address>
-
-Last modified: 28 October 1998
-
-</body>
-</html>
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