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<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_super_block&gt;<FONT SIZE=1.7>opt</FONT> &lt;root_group&gt; }
&lt;file_name&gt; ::= &lt;identifier&gt;
&lt;file_super_block&gt; ::= BOOT_BLOCK { &lt;super_block_content&gt; }
&lt;super_block_content&gt; ::= TBD
&lt;root_group&gt; ::= GROUP "/" { &lt;unamed_datatype&gt;* &lt;object_id&gt;<FONT SIZE=1.7>opt</FONT> &lt;group_attribute&gt;* &lt;group_member&gt;* }
&lt;unamed_datatype&gt ::= DATATYPE &lt;unamed_type_name&gt; { &lt;compound_type&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&gt; ::= &lt;member_type_def&gt;+
&lt;member_type_def&gt; ::= &lt;scalar_type_def&gt; | &lt;array_type_def&gt;
&lt;scalar_type_def&gt; ::= &lt;atomic_type&gt; &lt;field_name&gt; ;
&lt;atomic_type&gt; ::= &lt;integer&gt; | &lt;float&gt; | &lt;time&gt; | &lt;string&gt; | &lt;bitfield&gt; | &lt;opaque&gt; |
&lt;reference&gt; | &lt;enum&gt;
&lt;integer&gt; ::= H5T_STD_I8BE | H5T_STD_I8LE | H5T_STD_I16BE | H5T_STD_I16LE | H5T_STD_I32BE |
H5T_STD_I32LE | H5T_STD_I64BE | H5T_STD_I64LE | H5T_STD_U8BE |
H5T_STD_U8LE | H5T_STD_U16BE | H5T_STD_U16LE | H5T_STD_U32BE |
H5T_STD_U32LE | H5T_STD_U64BE | H5T_STD_U64LE | H5T_NATIVE_CHAR |
H5T_NATIVE_UCHAR | H5T_NATIVE_SHORT | H5T_NATIVE_USHORT |
H5T_NATIVE_INT | H5T_NATIVE_UINT | H5T_NATIVE_LONG | H5T_NATIVE_ULONG |
H5T_NATIVE_LLONG | H5T_NATIVE_ULLONG
&lt;float&gt; ::= H5T_IEEE_F32BE | H5T_IEEE_F32LE | H5T_IEEE_F64BE | H5T_IEEE_F64LE |
H5T_NATIVE_FLOAT | H5T_NATIVE_DOUBLE | H5T_NATIVE_LDOUBLE
&lt;time&gt; ::= TBD
&lt;string&gt; ::= { STRSIZE &lt;strsize&gt; ;
STRPAD &lt;strpad&gt; ;
CSET &lt;cset&gt; ;
CTYPE &lt;ctype&gt; ; }
&lt;strsize&gt; ::= an integer
&lt;strpad&gt; ::= H5T_STR_NULLTERM | H5T_STR_NULLPAD | H5T_STR_SPACEPAD
&lt;cset&gt; ::= H5T_CSET_ASCII
&lt;ctype&gt; ::= H5T_C_S1 | H5T_FORTRAN_S1
&lt;bitfield&gt; ::= TBD
&lt;opaque&gt; ::= TBD
&lt;reference&gt; ::= H5T_REFERENCE
&lt;field_name&gt; ::= &lt;identifier&gt;
&lt;array_type_def&gt; ::= &lt;atomic_type&gt; &lt;field_name&gt; &lt;dim_sizes&gt; ;
&lt;dim_sizes&gt; ::= [dimsize1][dimsize2]..., 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;object_id&gt;<FONT SIZE=1.7>opt</FONT>
&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;atomic_type&gt; } |
DATATYPE { &lt;compound_type&gt; } |
DATATYPE { &lt;named_type&gt; }
&lt;enum&gt; ::= H5T_ENUM { &lt;integer&gt;; &lt;enum_def&gt;+ }
&lt;enum_def&gt; ::= &lt;enum_symbol&gt; &lt;enum_val&gt;;
&lt;enum_symbol&gt; ::= &lt;identifier&gt;
&lt;enum_val&gt; ::= an integer;
&lt;named_type&gt; ::= &lt;path_name&gt;
&lt;path_name&gt; ::= &lt;identifier&gt
&lt;dataspace&gt; ::= DATASPACE { SCALAR } |
DATASPACE { SIMPLE &lt;current_dims&gt; / &lt;max_dims&gt; } |
DATASPACE { COMPLEX &lt;ds_definition&gt;+ }
DATASPACE { &lt;dataspace_name&gt; } |
&lt;current_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, <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;dataspace_name&gt; ::= &lt;identifier&gt;
&lt;data&gt; ::= DATA { &lt;scalar_space_data&gt; | &lt;simple_space_data&gt; | &lt;complex_space_data&gt; }
&lt;scalar_space_data&gt; ::= &lt;atomic_scalar_data&gt; | &lt;compound_scalar_data&gt;
&lt;atomic_scalar_data&gt; :: = &lt;integer_data&gt; | &lt;float_data&gt; | &lt;time_data&gt; | &lt;string_data&gt; |
&lt;bitfield_data&gt; | &lt;opaque_data&gt; | &lt;enum_data&gt; | &lt;reference_data&gt;
&lt;integer_data&gt; ::= an integer
&lt;float_data&gt; ::= a floating point number
&lt;time_data&gt; ::= TBD
&lt;string_data&gt; ::= a string
// A string is enclosed in double quotes.
// If a string is displayed on more than one line, string concatenate operator '//'is used.
&lt;bitfield_data&gt; ::= TBD
&lt;opaque_data&gt; ::= TBD
&lt;enum_data&gt; ::= &lt;enum_symbol&gt;
//maybe will be &lt;enum_symbol&gt; in the future
&lt;reference_data&gt; ::= &lt;object_ref_data&gt; | &lt;data_region_data&gt; | NULL
&lt;object_ref_data&gt; ::= &lt;object_type&gt; &lt;object_num&gt;
&lt;object_type&gt; ::= DATASET | GROUP | DATATYPE
&lt;object_id&gt; ::= OBJECTID { &lt;object_num&gt; }
&lt;object_num&gt; ::= an integer:an integer | an integer
&lt;data_region_data&gt; ::= H5T_STD_REF_DSETREG &lt;object_num&gt; {&lt;data_region_data_info&gt;,
&lt;data_region_data_info&gt;, ...}
&lt;data_region_data_info&gt; ::= &lt;region_info&gt; | &lt;point_info&gt;
&lt;region_info&gt; ::= (&lt;lower_bound&gt;:&lt;upper_bound&gt;, &lt;lower_bound&gt;:&lt;upper_bound&gt;, ...)
&lt;lower_bound&gt; ::= an integer
&lt;upper_bound&gt; ::= an integer
&lt;point_info&gt; ::= (an integer, an integer, ...)
&lt;compound_scalar_data&gt; ::= { [ &lt;member_data&gt; ], [ &lt;member_data&gt; ], ... }
&lt;member_data&gt; ::= &lt;atomic_scalar_data&gt; | &lt;atomic_simple_data&gt;
&lt;atomic_simple_data&gt; :: = &lt;atomic_element&gt;, &lt;atomic_element&gt;, ...
&lt;atomic_element&gt; ::= &lt;atomic_scalar_data&gt;
&lt;simple_space_data&gt; :: = &lt;atomic_simple_data&gt; | &lt;compound_simple_data&gt;
&lt;compound_simple_data&gt; ::= &lt;compoud_element&gt;, &lt;compound_element&gt;, ...
&lt;compound_element&gt; ::= &lt;compound_scalar_data&gt;
&lt;complex_space_data&gt; ::= 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&gt; }
&lt;type_name&gt; ::= &lt;identifier&gt;
&lt;named_dataspace&gt; ::= TBD
&lt;group&gt; ::= GROUP &lt;group_name&gt; { &lt;hardlink&gt; } |
GROUP &lt;object_id&gt;<FONT SIZE=1.7>opt</FONT> &lt;group_name&gt; { &lt;group_attribute&gt;* &lt;group_member&gt;* }
&lt;group_name&gt; ::= &lt;identifier&gt;
&lt;hardlink&gt; ::= HARDLINK &lt;path_name&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;object_id&gt;<FONT SIZE=1.7>opt</FONT>
&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 "/" {
ATTRIBUTE "attr1" {
DATATYPE {
{ STRSIZE 17;
STRPAD H5T_STR_NULLTERM;
CSET H5T_CSET_ASCII;
CTYPE H5T_C_S1;
}
}
DATASPACE { SCALAR }
DATA {
"string attribute"
}
}
DATASET "dset1" {
DATATYPE { H5T_STD_I32BE }
DATASPACE { SIMPLE ( 10, 10 ) / ( 10, 10 ) }
DATA {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
}
}
DATASET "dset2" {
DATATYPE {
H5T_STD_I32BE "a";
H5T_IEEE_F32BE "b";
H5T_IEEE_F64BE "c";
}
DATASPACE { SIMPLE ( 5 ) / ( 5 ) }
DATA {
{
[ 1 ],
[ 0.1 ],
[ 0.01 ]
},
{
[ 2 ],
[ 0.2 ],
[ 0.02 ]
},
{
[ 3 ],
[ 0.3 ],
[ 0.03 ]
},
{
[ 4 ],
[ 0.4 ],
[ 0.04 ]
},
{
[ 5 ],
[ 0.5 ],
[ 0.05 ]
}
}
}
GROUP "group1" {
DATASET "dset3" {
DATATYPE {
"/type1"
}
DATASPACE { SIMPLE ( 5 ) / ( 5 ) }
DATA {
{
[ 0, 1, 2, 3 ],
[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
},
{
[ 0, 1, 2, 3 ],
[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
},
{
[ 0, 1, 2, 3 ],
[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
},
{
[ 0, 1, 2, 3 ],
[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
},
{
[ 0, 1, 2, 3 ],
[ 0.1, 0.1, 0.1, 0.1, 0.1, 0.1,
0.2, 0.2, 0.2, 0.2, 0.2, 0.2,
0.3, 0.3, 0.3, 0.3, 0.3, 0.3,
0.4, 0.4, 0.4, 0.4, 0.4, 0.4,
0.5, 0.5, 0.5, 0.5, 0.5, 0.5 ]
}
}
}
}
GROUP "group2" {
HARDLINK "/group1"
}
SOFTLINK "slink1" {
LINKTARGET "somevalue"
}
DATATYPE "type1" {
H5T_STD_I32BE "a"[4];
H5T_IEEE_F32BE "b"[5][6];
}
}
}
</pre>
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<address>
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
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