mirror of
https://github.com/HDFGroup/hdf5.git
synced 2024-11-21 01:04:10 +08:00
b44a58dc42
Purpose:
Update "Describes HDF5 Release..." footer from R1.4 to
"Release 1.5, Unreleased Development Branch"
Platforms tested:
IE 5
556 lines
17 KiB
HTML
556 lines
17 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"><strong>HDF5 User's Guide:</strong></a>
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<br>
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<a href="Files.html">Files</a>
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<a href="Datasets.html">Datasets</a>
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<a href="Datatypes.html">Datatypes</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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<br>
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<a href="References.html">References</a>
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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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<br>
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<a href="Filters.html">Filters</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="MountingFiles.html">Mounting Files</a>
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<br>
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<a href="Performance.html">Performance</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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</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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[0-9] an element in the range between 0 and 9
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`[' the token within the quotes (used for special characters)
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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_super_block><FONT SIZE=1.7>opt</FONT> <root_group> }
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<file_name> ::= <identifier>
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<file_super_block> ::= BOOT_BLOCK { <super_block_content> }
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<super_block_content> ::= TBD
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<root_group> ::= GROUP "/" { <unamed_datatype>* <object_id><FONT SIZE=1.7>opt</FONT>
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<group_attribute>* <group_member>* }
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<datatype> ::= <atomic_type> | <compound_type> | <variable_length_type> | <array_type>
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<unamed_datatype> ::= DATATYPE <unamed_type_name> { <datatype> }
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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
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of the type
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<atomic_type> ::= <integer> | <float> | <time> | <string> |
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<bitfield> | <opaque> | <reference> | <enum>
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<integer> ::= H5T_STD_I8BE | H5T_STD_I8LE |
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H5T_STD_I16BE | H5T_STD_I16LE |
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H5T_STD_I32BE | H5T_STD_I32LE |
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H5T_STD_I64BE | H5T_STD_I64LE |
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H5T_STD_U8BE | H5T_STD_U8LE |
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H5T_STD_U16BE | H5T_STD_U16LE |
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H5T_STD_U32BE | H5T_STD_U32LE |
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H5T_STD_U64BE | H5T_STD_U64LE |
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H5T_NATIVE_CHAR | H5T_NATIVE_UCHAR |
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H5T_NATIVE_SHORT | H5T_NATIVE_USHORT |
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H5T_NATIVE_INT | H5T_NATIVE_UINT |
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H5T_NATIVE_LONG | H5T_NATIVE_ULONG |
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H5T_NATIVE_LLONG | H5T_NATIVE_ULLONG
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<float> ::= H5T_IEEE_F32BE | H5T_IEEE_F32LE |
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H5T_IEEE_F64BE | H5T_IEEE_F64LE |
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H5T_NATIVE_FLOAT | H5T_NATIVE_DOUBLE |
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H5T_NATIVE_LDOUBLE
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<time> ::= TBD
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<string> ::= H5T_STRING { STRSIZE <strsize> ;
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STRPAD <strpad> ;
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CSET <cset> ;
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CTYPE <ctype> ; }
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<strsize> ::= <int_value>
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<strpad> ::= H5T_STR_NULLTERM | H5T_STR_NULLPAD | H5T_STR_SPACEPAD
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<cset> ::= H5T_CSET_ASCII
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<ctype> ::= H5T_C_S1 | H5T_FORTRAN_S1
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<bitfield> ::= TBD
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<opaque> ::= H5T_OPAQUE { <identifier> }
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<reference> ::= H5T_REFERENCE { <ref_type> }
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<ref_type> ::= H5T_STD_REF_OBJECT | H5T_STD_REF_DSETREG
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<compound_type> ::= H5T_COMPOUND { <member_type_def>+ }
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<member_type_def> ::= <datatype> <field_name> ;
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<field_name> ::= <identifier>
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<variable_length_type> ::= H5T_VLEN { <datatype> }
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<array_type> ::= H5T_ARRAY { <dim_sizes> <datatype> }
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<dim_sizes> ::= `['<dimsize>`]' | `['<dimsize>`]'<dim_sizes>
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<dimsize> ::= <int_value>
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<attribute> ::= ATTRIBUTE <attr_name> { <dataset_type>
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<dataset_space>
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<data><FONT SIZE=1.7>opt</FONT> }
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<attr_name> ::= <identifier>
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<dataset_type> ::= DATATYPE <path_name> | <datatype>
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<enum> ::= H5T_ENUM { <enum_base_type> <enum_def>+ }
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<enum_base_type> ::= <integer>
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// Currently enums can only hold integer type data, but they may be expanded
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// in the future to hold any datatype
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<enum_def> ::= <enum_symbol> <enum_val>;
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<enum_symbol> ::= <identifier>
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<enum_val> ::= <int_value>
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<path_name> ::= <path_part>+
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<path_part> ::= /<identifier>
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<dataspace> ::= <scalar_space> | <simple_space> | <complex_space>
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<scalar_space> ::= SCALAR
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<simple_space> ::= SIMPLE { <current_dims> / <max_dims> }
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<complex_space> ::= COMPLEX { <complex_space_definition> }
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<dataset_space> ::= DATASPACE <path_name> | <dataspace>
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<current_dims> ::= <dims>
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<max_dims> ::= `(' <max_dim_list> `)'
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<max_dim_list> ::= <max_dim> | <max_dim>, <max_dim_list>
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<max_dim> ::= <int_value> | H5S_UNLIMITED
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<complex_space_definition> ::= TBD
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<data> ::= DATA { <scalar_space_data> | <simple_space_data> | <complex_space_data> } | <subset>
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<scalar_space_data> ::= <any_element>
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<any_element> ::= <atomic_element> | <compound_element> |
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<variable_length_element> | <array_element>
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<any_data_seq> ::= <any_element> | <any_element>, <any_data_seq>
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<atomic_element> :: = <integer_data> | <float_data> | <time_data> |
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<string_data> | <bitfield_data> | <opaque_data> |
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<enum_data> | <reference_data>
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<subset> ::= SUBSET { <start>;
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<stride>;
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<count>;
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<block>;
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DATA { <simple_space_data> }
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}
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<start> ::= START (<coor_list>)
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<stride> ::= STRIDE (<pos_list>)
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<count> ::= COUNT (<coor_list>)
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<block> ::= BLOCK (<coor_list>)
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<coor_list> ::= <int_value>, <coor_list> | <int_value>
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<integer_data> ::= <int_value>
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<float_data> ::= a floating point number
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<time_data> ::= TBD
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<string_data> ::= a string
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// A string is enclosed in double quotes.
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// If a string is displayed on more than one line, string concatenate
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// operator '//'is used.
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<bitfield_data> ::= TBD
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<opaque_data> ::= TBD
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<enum_data> ::= <enum_symbol>
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<reference_data> ::= <object_ref_data> | <data_region_data> | NULL
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<object_ref_data> ::= <object_type> <object_num>
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<object_type> ::= DATASET | GROUP | DATATYPE
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<object_id> ::= OBJECTID { <object_num> }
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<object_num> ::= <int_value>:<int_value> | <int_value>
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<data_region_data> ::= H5T_STD_REF_DSETREG <object_num> { <data_region_data_list> }
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<data_region_data_list> ::= <data_region_data_info>, <data_region_data_list> | <data_region_data_info>
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<data_region_data_info> ::= <region_info> | <point_info>
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<region_info> ::= (<region_vals>)
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<region_vals> ::= <lower_bound>:<upper_bound>, <region_vals> | <lower_bound>:<upper_bound>
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<lower_bound> ::= <int_value>
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<upper_bound> ::= <int_value>
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<point_info> ::= (<point_vals>)
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<point_vals> ::= <int_value> | <int_value>, <point_vals>
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<compound_element> ::= { <any_data_seq> }
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<atomic_simple_data> :: = <atomic_element>, <atomic_simple_data> | <atomic_element>
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<simple_space_data> :: = <any_data_seq>
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<variable_length_element> ::= ( <any_data_seq> )
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<array_element> ::= `[' <any_data_seq> `]'
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<complex_space_data> ::= TBD
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<named_datatype> ::= DATATYPE <type_name> { <datatype> }
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<type_name> ::= <identifier>
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<named_dataspace> ::= TBD
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<hardlink> ::= HARDLINK <path_name>
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<group> ::= GROUP <group_name> { <hardlink> | <group_info> }
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<group_name> ::= <identifier>
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<group_info> ::= <group_attribute>* <group_member>*
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<group_attribute> ::= <attribute>
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<group_member> ::= <named_datatype> | <named_dataspace> | <group> |
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<dataset> | <softlink>
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<dataset> ::= DATASET <dataset_name> { <hardlink> | <dataset_info> }
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<dataset_info> ::= <dataset_type> <dataset_space> <storagelayout><FONT SIZE=1.7>opt</FONT>
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<compression><FONT SIZE=1.7>opt</FONT> <dataset_attribute>* <object_id><FONT SIZE=1.7>opt</FONT>
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<data><FONT SIZE=1.7>opt</FONT>
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// Tokens above can be in any order as long as <data> is
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// after <dataset_type> and <dataset_space>.
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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> ::= (<dims_values>)
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<dims_values> ::= <int_value> | <int_value>, <dims_values>
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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> ::= <int_value>
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<size> ::= <int_value>
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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> ::= a string
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// character '/' should be used with care.
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<pos_list> ::= <pos_int>, <pos_list> | <pos_int>
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<int_value> ::= 0 | <pos_int>
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<pos_int> ::= [1-9][0-9]*
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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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ATTRIBUTE "attr1" {
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DATATYPE H5T_STRING {
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STRSIZE 17;
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STRPAD H5T_STR_NULLTERM;
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CSET H5T_CSET_ASCII;
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CTYPE H5T_C_S1;
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}
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DATASPACE SCALAR
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DATA {
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"string attribute"
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}
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}
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DATASET "dset1" {
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DATATYPE H5T_STD_I32BE
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DATASPACE SIMPLE { ( 10, 10 ) / ( 10, 10 ) }
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DATA {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9
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}
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}
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DATASET "dset2" {
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DATATYPE H5T_COMPOUND {
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H5T_STD_I32BE "a";
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H5T_IEEE_F32BE "b";
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H5T_IEEE_F64BE "c";
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}
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DATASPACE SIMPLE { ( 5 ) / ( 5 ) }
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DATA {
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{
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1,
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0.1,
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0.01
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},
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{
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2,
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0.2,
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0.02
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},
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{
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3,
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0.3,
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0.03
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},
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{
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4,
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0.4,
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0.04
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},
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{
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5,
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0.5,
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0.05
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}
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}
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}
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GROUP "group1" {
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DATASET "dset3" {
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DATATYPE "/type1"
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DATASPACE SIMPLE { ( 5 ) / ( 5 ) }
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DATA {
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{
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[ 0, 1, 2, 3 ],
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[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
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0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
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0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
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0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
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0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
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},
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{
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[ 0, 1, 2, 3 ],
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[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
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0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
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0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
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0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
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0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
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},
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{
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[ 0, 1, 2, 3 ],
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[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
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0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
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0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
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0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
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0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
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},
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{
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[ 0, 1, 2, 3 ],
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[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
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0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
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0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
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0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
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0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
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},
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{
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[ 0, 1, 2, 3 ],
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[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
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0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
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0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
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0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
|
|
0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
DATASET "dset3" {
|
|
DATATYPE H5T_VLEN { H5T_STD_I32LE }
|
|
DATASPACE SIMPLE { ( 4 ) / ( 4 ) }
|
|
DATA {
|
|
(0), (10, 11), (20, 21, 22), (30, 31, 32, 33)
|
|
}
|
|
}
|
|
GROUP "group2" {
|
|
HARDLINK "/group1"
|
|
}
|
|
SOFTLINK "slink1" {
|
|
LINKTARGET "somevalue"
|
|
}
|
|
DATATYPE "type1" H5T_COMPOUND {
|
|
H5T_ARRAY { [4] H5T_STD_I32BE } "a";
|
|
H5T_ARRAY { [5][6] H5T_IEEE_F32BE } "b";
|
|
}
|
|
}
|
|
}
|
|
</pre>
|
|
</dir>
|
|
|
|
|
|
<hr>
|
|
<center>
|
|
<table border=0 width=98%>
|
|
<tr><td valign=top align=left>
|
|
<a href="H5.intro.html">Introduction to HDF5</a> <br>
|
|
<a href="RM_H5Front.html">HDF5 Reference Manual</a> <br>
|
|
<a href="index.html">Other HDF5 documents and links</a> <br>
|
|
<!--
|
|
<a href="Glossary.html">Glossary</a><br>
|
|
-->
|
|
</td>
|
|
<td valign=top align=right>
|
|
And in this document, the
|
|
<a href="H5.user.html"><strong>HDF5 User's Guide:</strong></a>
|
|
<br>
|
|
<a href="Files.html">Files</a>
|
|
<a href="Datasets.html">Datasets</a>
|
|
<a href="Datatypes.html">Datatypes</a>
|
|
<a href="Dataspaces.html">Dataspaces</a>
|
|
<a href="Groups.html">Groups</a>
|
|
<br>
|
|
<a href="References.html">References</a>
|
|
<a href="Attributes.html">Attributes</a>
|
|
<a href="Properties.html">Property Lists</a>
|
|
<a href="Errors.html">Error Handling</a>
|
|
<br>
|
|
<a href="Filters.html">Filters</a>
|
|
<a href="Caching.html">Caching</a>
|
|
<a href="Chunking.html">Chunking</a>
|
|
<a href="MountingFiles.html">Mounting Files</a>
|
|
<br>
|
|
<a href="Performance.html">Performance</a>
|
|
<a href="Debugging.html">Debugging</a>
|
|
<a href="Environment.html">Environment</a>
|
|
DDL
|
|
</td></tr>
|
|
</table>
|
|
</center>
|
|
|
|
|
|
<hr>
|
|
<address>
|
|
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
|
|
</address>
|
|
|
|
Last modified: 17 November 2000
|
|
|
|
<br>
|
|
Describes HDF5 Release 1.5, Unreleased Development Branch
|
|
|
|
|
|
</body>
|
|
</html>
|