82fb21b613
been checked into "HDF5 Development" branch. General ======= Various "copy edit" types of repairs. Revisions to document cross-linking. Added structural links tying all docs together (banners at top and bottom of documents, similar to Reference Manual banners of the Beta release). Set background color to white in all documents. NCSAfooterlogo.gif hdf2.jpg New image files to make the documents more self-contained (i.e., to prevent loading images from NCSA and HDF home servers). index.html Redesigned to isolate links external to the installation in a single location. Intro to HDF5 ============= H5.intro.html Fixed banner linking Intro to other docs. Set all URLs to be relative within the distribution; nothing points back to the HDF server. Updates to "Limits of the Current Release" and "Changes in the Current Release." HDF5 User's Guide ================= Changed several User Guide section titles such that all sections that are primarily about a particular interface are now titled in the format "The xxxxx Interface (H5x)". H5.user.html Commented out links to developer docs since they are marked in MANIFEST as not being for distribution in the release. Removed 2nd and 3rd indices from page. Changed "freeform" lists of sections (TOCs) to aligned tables. Datatypes.html Removed the sentence "I'm deferring definition until later since they're probably not as important as the other data types." from Section 3.3, "Properties of Date and Time Atomic Types." Added info regarding 'char' versus 'string' datatypes. Added as Section 3.7, "Character and String Datatype Issues." References.html Commented out substantial material (at end of document) from References planning document that is not appropriate for the User Guide but that is worth keeping around. Groups.html Final edits from elimination of "current working group." HDF5 Reference Manual ===================== Removed "Draft" from the <title>__</title> lines. RM_H5Front.html Removed 2nd and 3rd indices from page. Changed "freeform" lists of sections (TOCs) to aligned tables. RM_H5F.html RM_H5P.html Add file mounting information.
331 lines
11 KiB
HTML
331 lines
11 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<title>DDL for HDF5</title>
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</head>
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<body bgcolor="#FFFFFF">
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<hr>
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<center>
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<table border=0 width=98%>
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<tr><td valign=top align=left>
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<a href="H5.intro.html">Introduction to HDF5</a> <br>
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<a href="RM_H5Front.html">HDF5 Reference Manual</a> <br>
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<a href="index.html">Other HDF5 documents and links</a> <br>
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<!--
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<a href="Glossary.html">Glossary</a><br>
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-->
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</td>
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<td valign=top align=right>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Files.html">Files</a>
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<br>
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<a href="Datasets.html">Datasets</a>
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<a href="Datatypes.html">Data Types</a>
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<a href="Dataspaces.html">Dataspaces</a>
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<a href="Groups.html">Groups</a>
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<a href="References.html">References</a>
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<br>
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<a href="Attributes.html">Attributes</a>
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<a href="Properties.html">Property Lists</a>
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<a href="Errors.html">Error Handling</a>
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<a href="Filters.html">Filters</a>
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<a href="Caching.html">Caching</a>
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<br>
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<a href="Chunking.html">Chunking</a>
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<a href="Debugging.html">Debugging</a>
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<a href="Environment.html">Environment</a>
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DDL
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<a href="Ragged.html">Ragged Arrays</a>
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<!--
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<hr>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Attributes.html">H5A</a>
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<a href="Datasets.html">H5D</a>
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<a href="Errors.html">H5E</a>
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<a href="Files.html">H5F</a>
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<a href="Groups.html">H5G</a>
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<a href="Properties.html">H5P</a>
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<a href="References.html">H5R & H5I</a>
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<a href="Ragged.html">H5RA</a>
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<a href="Dataspaces.html">H5S</a>
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<a href="Datatypes.html">H5T</a>
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<a href="Filters.html">H5Z</a>
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<a href="Caching.html">Caching</a>
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<a href="Chunking.html">Chunking</a>
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<a href="Debugging.html">Debugging</a>
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<a href="Environment.html">Environment</a>
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<a href="ddl.html">DDL</a>
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-->
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</td></tr>
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</table>
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</center>
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<hr>
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<h1>DDL in BNF for HDF5</h1>
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<h2>1. Introduction</h2>
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This document contains the data description language (DDL) for an HDF5 file.
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The description is in Backus-Naur Form.
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<h2>2. Explanation of Symbols</h2>
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This section contains a brief explanation of the symbols used in the DDL.
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<PRE>
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::= defined as
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<tname> a token with the name tname
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<a> | <b> one of <a> or <b>
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<a><FONT SIZE=1.7>opt</FONT> zero or one occurrence of <a>
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<a>* zero or more occurrence of <a>
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<a>+ one or more occurrence of <a>
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TBD To Be Decided
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</pre>
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<h2>3. The DDL</h2>
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<dir>
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<pre>
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<file> ::= HDF5 "<file_name>" { <file_boot_block><FONT SIZE=1.7>opt</FONT> <root_group> }
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<file_name> ::= <identifier>
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<file_boot_block> ::= BOOT_BLOCK { <boot_block_content> }
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<boot_block_content> ::= TBD
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<root_group> ::= GROUP "/" { <unamed_datatype>* <group_attribute>* <group_member>* }
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<unamed_datatype> ::= DATATYPE "<unamed_type_name>" { <compound_type_def>+ }
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<unamed_type_name> ::= the assigned name for unamed type is in the form of
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#oid1:oid2, where oid1 and oid2 are the object ids of the type
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<compound_type_def> ::= <named_scalar_type> | <named_array_type>
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<named_scalar_type> ::= <scalar_type> <field_name> ;
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<scalar_type> ::= H5T_STD_I8BE | H5T_STD_I8LE | ...
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<field_name> ::= <identifier>
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<named_array_type> ::= <scalar_type> <field_name> <dim_sizes> ;
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<dim_sizes> ::= dimension sizes in the form of [dimsize1][dimzise2]...,
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where dimsize1, dimsize2 are integers
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<group_attribute> ::= <attribute>
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<attribute> ::= ATTRIBUTE "<attr_name>" { <datatype>
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<dataspace>
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<data><FONT SIZE=1.7>opt</FONT> }
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// <datatype> and <dataspace> must appear before <data>.
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<attr_name> ::= <identifier>
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<datatype> ::= DATATYPE { <named_type> } |
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DATATYPE { "<scalar_type>" } |
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DATATYPE { <compound_type_def>+ }
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<named_type> ::= <hardlink>
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<hardlink> ::= HARDLINK { "<abs_name>" }
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<abs_name> ::= object absolute name
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<dataspace> ::= DATASPACE { "<dataspace_name>" } |
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DATASPACE { ARRAY <current_dims> <max_dims> } |
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DATASPACE { OTHER <ds_definition>+ }
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<dataspace_name> ::= <identifier>
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<current_dims> ::= 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>, ... ),
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where <i>i<FONT SIZE=1.0>k</i></FONT> is an integer, <i>k</i> = 1,2,...
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<max_dims> ::= (<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
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<ds_definition> ::= TBD
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<data> ::= data {TBD}
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<group_member> ::= <named_datatype> | <named_dataspace> | <group> | <dataset> |
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<softlink>
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<named_datatype> ::= DATATYPE "<type_name>" { <compound_type_def>+ }
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<type_name> ::= "<identifier>"
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<named_dataspace> ::= DATASPACE "<dataspace_name>" { ARRAY <current_dims> <max_dims> } |
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DATASPACE "<dataspace_name>" { OTHER <ds_definition>+ }
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<group> ::= GROUP "<group_name>" { <hardlink> } |
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GROUP "<group_name>" { <group_attribute>* <group_member>* }
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<group_name> ::= <identifier>
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<dataset> ::= DATASET "<dataset_name>" { <hardlink> } |
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DATASET "<dataset_name>" { <datatype>
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<dataspace>
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<storagelayout><FONT SIZE=1.7>opt</FONT>
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<compression><FONT SIZE=1.7>opt</FONT>
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<dataset_attribute>*
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<data><FONT SIZE=1.7>opt</FONT> }
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// Tokens within {} can be in any order as long as <data> and <dataset_attribute>
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// are after <datatype> and <dataspace>.
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<dataset_name> ::= <identifier>
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<storagelayout> :: = STORAGELAYOUT <contiguous_layout> |
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STORAGELAYOUT <chunked_layout> |
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STORAGELAYOUT <compact_layout> |
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STORAGELAYOUT <external_layout>
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<contiguous_layout> ::= {CONTIGUOUS} // default
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<chunked_layout> ::= {CHUNKED <dims> }
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<dims> ::= (<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,...
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<compact_layout> ::= TBD
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<external_layout> ::= {EXTERNAL <external_file>+ }
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<external_file> ::= (<file_name> <offset> <size>)
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<offset> ::= an integer
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<size> ::= an integer
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<compression> :: = COMPRESSION { TBD }
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<dataset_attribute> ::= <attribute>
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<softlink> ::= SOFTLINK "<softlink_name>" { LINKTARGET "<target>" }
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<softlink_name> ::= <identifier>
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<target> ::= <identifier>
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<identifier> ::= string
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// character '/' should be used with care.
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</PRE>
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</dir>
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<h2>4. An Example of an HDF5 File in DDL</h2>
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<dir>
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<PRE>
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HDF5 "example.h5" {
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GROUP "/" {
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DATASET "dset1" {
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DATATYPE {
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H5T_STD_I32BE int_name;
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H5T_IEEE_F32BE float_name;
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H5T_IEEE_F64BE double_name;
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}
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DATASPACE { ARRAY ( 5 ) ( 5 ) }
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DATA {{0,0,1}, {1,1,0.5}, {2,4,0.333333}, {3,9,0.25}, {4,16,0.2}}
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}
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GROUP "group1" {
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DATASET "dset2" {
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DATATYPE {
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HARDLINK { "/type1" }
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}
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DATASPACE { ARRAY ( 5 ) ( 5 ) }
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DATA {{0,0}, {1,1.1}, {2,2.2}, {3,3.3}, {4,4.4}}
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}
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}
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GROUP "group2" {
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HARDLINK { "/group1" }
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}
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SOFTLINK "slink1" {
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LINKTARGET "somevalue"
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}
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DATATYPE "type1" {
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H5T_STD_I32BE int_name;
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H5T_IEEE_F32BE float_name;
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}
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}
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}
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</pre>
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</dir>
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<hr>
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<center>
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<table border=0 width=98%>
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<tr><td valign=top align=left>
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<a href="H5.intro.html">Introduction to HDF5</a> <br>
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<a href="RM_H5Front.html">HDF5 Reference Manual</a> <br>
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<a href="index.html">Other HDF5 documents and links</a> <br>
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<!--
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<a href="Glossary.html">Glossary</a><br>
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-->
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</td>
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<td valign=top align=right>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Files.html">Files</a>
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<br>
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<a href="Datasets.html">Datasets</a>
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<a href="Datatypes.html">Data Types</a>
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<a href="Dataspaces.html">Dataspaces</a>
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<a href="Groups.html">Groups</a>
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<a href="References.html">References</a>
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<br>
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<a href="Attributes.html">Attributes</a>
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<a href="Properties.html">Property Lists</a>
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<a href="Errors.html">Error Handling</a>
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<a href="Filters.html">Filters</a>
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<a href="Caching.html">Caching</a>
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<br>
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<a href="Chunking.html">Chunking</a>
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<a href="Debugging.html">Debugging</a>
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<a href="Environment.html">Environment</a>
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DDL
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<a href="Ragged.html">Ragged Arrays</a>
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<!--
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<hr>
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And in this document, the
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<a href="H5.user.html">HDF5 User's Guide</a>:
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<a href="Attributes.html">H5A</a>
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<a href="Datasets.html">H5D</a>
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<a href="Errors.html">H5E</a>
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<a href="Files.html">H5F</a>
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<a href="Groups.html">H5G</a>
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<a href="Properties.html">H5P</a>
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<a href="References.html">H5R & H5I</a>
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<a href="Ragged.html">H5RA</a>
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<a href="Dataspaces.html">H5S</a>
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<a href="Datatypes.html">H5T</a>
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<a href="Filters.html">H5Z</a>
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<a href="Caching.html">Caching</a>
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<a href="Chunking.html">Chunking</a>
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<a href="Debugging.html">Debugging</a>
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<a href="Environment.html">Environment</a>
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<a href="ddl.html">DDL</a>
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-->
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</td></tr>
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</table>
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</center>
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<hr>
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<address>
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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
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</address>
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Last modified: 30 October 1998
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</body>
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</html>
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