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<html>
<head>
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<title>
HDF5 API Specification
</title>
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<center>
<table border=0 width=98%>
<tr><td valign=top align=left>
<a href="index.html">HDF5 documents and links</a> <br>
<a href="H5.intro.html">Introduction to HDF5</a> <br>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br>
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And in this document, the
<a href="RM_H5Front.html">HDF5 Reference Manual</a>
<br>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5im.html">H5IM</a>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5lt.html">H5LT</a>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5pt.html">H5PT</a>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5tb.html">H5TB</a>
<br>
<a href="RM_H5.html">H5</a>
<a href="RM_H5A.html">H5A</a>
<a href="RM_H5D.html">H5D</a>
<a href="RM_H5E.html">H5E</a>
<a href="RM_H5F.html">H5F</a>
<a href="RM_H5G.html">H5G</a>
<a href="RM_H5I.html">H5I</a>
<a href="RM_H5P.html">H5P</a>
<br>
<a href="RM_H5R.html">H5R</a>
<a href="RM_H5S.html">H5S</a>
<a href="RM_H5T.html">H5T</a>
<a href="RM_H5Z.html">H5Z</a>
<a href="Tools.html">Tools</a>
<a href="PredefDTypes.html">Datatypes</a>
</td></tr>
</table>
</center>
<hr><!-- #EndLibraryItem --><center>
<h1>HDF5: API Specification<br>Reference Manual</h1>
</center>
The HDF5 library provides several interfaces, each of which provides the
tools required to meet specific aspects of the HDF5 data-handling requirements.
<p>
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<p>
<center>
<table border="1" width="80%">
<tr align="center" valign="middle">
<td width="33%"><a href="#HighLevelAPIs">High-level APIs</a></td>
<td width="34%"><a href="#LowLevelAPIs">Main HDF5 Library,
<br>including Low-level APIs</a></td>
<td width="33%"><a href="#F90andCPPlus">Fortran and C++
<br>Interfaces</a></td>
</tr>
</table>
</center>
<br>
<a name="HighLevelAPIs"><br></a>
<center>
<table border=0 width="100%">
<tr>
<td valign="top" colspan="4">
<h3>High-level HDF5 APIs</h3>
The HDF5 Library includes several sets of convenience and
standard-use APIs.
The HDF5 Lite APIs are convenience functions designed to
facilitate common HDF5 operations.
The HDF5 Image, HDF5 Table and HDF5 Packet Table APIs
implement standardized approaches to common use cases
with the intention of improving interoperability.
</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5lt.html">Lite</a></td>
<td> </td>
<td valign=top>The <strong>H5LT</strong>
API<b><strong> </strong></b>general higher-level functions</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5im.html">Image</a></td>
<td> </td>
<td valign=top>The <strong>H5IM</strong> API for images</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5tb.html">Table</a></td>
<td> </td>
<td valign=top>The <strong>H5TB</strong> API for manipulating
table datasets </td>
</tr>
<tr>
<!-- This row is formatted as it is in an attempt to set the -->
<!-- format of the table containing the high- and low-level API -->
<!-- section listings. -->
<td valign="top" width="10%"> </td>
<td valign=top>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5pt.html">Packet Table</a>
</td>
<td> </td>
<td valign=top>The <strong>H5PT</strong> API for managing packet tables (and <a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5pt_c++.html">C++ H5PT wrappers</a>)
</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5ds.html">Dimension Scales</a></td>
<td> </td>
<td valign=top>The <strong>H5DS</strong> API for managing dimension scales </td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td> </td>
<td> </td>
<td><a name="LowLevelAPIs"> </a></td>
</tr>
<tr>
<td valign="top" colspan="4">
<h3>Main HDF5 Library, or Low-level APIs</h3>
The main HDF5 Library includes all of the low-level APIs,
providing user applications with fine-grain control of
HDF5 functionality.
</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5.html">Library Functions</a></td>
<td> </td><td valign=top>The general-purpose
<strong>H5</strong> functions.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5A.html">Attribute Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5A</strong> API for attributes.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5D.html">Dataset Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5D</strong> API for manipulating
scientific datasets.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5E.html">Error Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5E</strong> API for error handling.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5F.html">File Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5F</strong> API for accessing HDF files.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5G.html">Group Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5G</strong> API for creating physical
groups of objects on disk.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5I.html">Identifier Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5I</strong> API for working with
object identifiers.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5P.html">Property List Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5P</strong> API for manipulating
object property lists.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5R.html">Reference Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5R</strong> API for references.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5S.html">Dataspace Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5S</strong> API for defining dataset
dataspace.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5T.html">Datatype Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5T</strong> API for defining dataset
element information.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="RM_H5Z.html">Filters and</a><br>
<a href="RM_H5Z.html">Compression Interface</a></td>
<td> </td>
<td valign=top>The <strong>H5Z</strong> API for inline data filters
and data compression.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="Tools.html">Tools</a></td>
<td> </td>
<td valign=top>Interactive tools for the examination
of existing HDF5 files.</td>
</tr>
<tr>
<td valign="top" width="10%"> </td>
<td valign=top><a href="PredefDTypes.html">Predefined Datatypes</a></td>
<td> </td>
<td valign=top>Predefined datatypes in HDF5.
<!--
</td></tr>
<tr><td valign=top><a href="Glossary.html">Glossary</a>
</td><td></td><td valign=top>A glossary of data-types used in the APIs.
-->
</td>
</tr>
</table>
</center>
<p>
A PDF version of this <cite>HDF5 Reference Manual</cite> will be available
from <a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/PSandPDF/">
http://hdf.ncsa.uiuc.edu/HDF5/doc/PSandPDF/</a>
approximately one week after each release.
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<h3>The Fortran90 and C++ APIs to HDF5</h3>
</a>
The HDF5 Library distribution includes FORTRAN90 and C++ APIs,
which are described in the following documents.
<p>
<strong>Fortran90 API</strong>
<dir>
<a href="fortran/F90UserNotes.html" target="External">
<cite>HDF5 FORTRAN90 User's Notes</cite></a>
contains general information regarding the API.
Specific information on each API call is found in the
<cite>HDF5 Reference Manual</cite>.
<p>
<u>Fortran90 APIs in the <cite>Reference Manual</cite>:</u>
The current version of the <cite>HDF5 Reference Manual</cite> includes
descriptions of the Fortran90 APIs to HDF5.
Fortran subroutines exist in the H5, H5A, H5D, H5E, H5F, H5G, H5I, H5P,
H5R, H5S, H5T, and H5Z interfaces and are described on those pages.
In general, each Fortran subroutine performs exactly the same task
as the corresponding C function.
<p>
Whereas Fortran subroutines had been described on separate pages in
prior releases, those descriptions were fully integrated into the
body of the reference manual for HDF5 Release 1.6.2
(and mostly so for Release 1.6.1).
<p>
<a href="fortran/F90Flags.html" target="External">
<cite>HDF5 Fortran90 Flags and Datatypes</cite></a>
lists the flags employed in the Fortran90 interface and
contains a pointer to the HDF5 Fortran90 datatypes.
</dir>
<strong>C++ API</strong>
<dir>
<a href="cpplus/CppUserNotes.pdf" target="External">
<cite>HDF5 C++ User's Notes</cite></a>
<p>
<a href="cpplus/CppInterfaces.html" target="External">
<cite>HDF5 C++ Interfaces</cite></a>
<!--
<p>
(Note that the C++ APIs are not yet integrated into the
<cite>HDF5 Reference Manual</cite>.)
-->
</dir>
<br><br>
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<table border=0 width=98%>
<tr><td valign=top align=left>
<a href="index.html">HDF5 documents and links</a> <br>
<a href="H5.intro.html">Introduction to HDF5</a> <br>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br>
<!--
<a href="Glossary.html">Glossary</a><br>
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</td>
<td valign=top align=right>
And in this document, the
<a href="RM_H5Front.html">HDF5 Reference Manual</a>
<br>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5im.html">H5IM</a>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5lt.html">H5LT</a>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5pt.html">H5PT</a>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5tb.html">H5TB</a>
<br>
<a href="RM_H5.html">H5</a>
<a href="RM_H5A.html">H5A</a>
<a href="RM_H5D.html">H5D</a>
<a href="RM_H5E.html">H5E</a>
<a href="RM_H5F.html">H5F</a>
<a href="RM_H5G.html">H5G</a>
<a href="RM_H5I.html">H5I</a>
<a href="RM_H5P.html">H5P</a>
<br>
<a href="RM_H5R.html">H5R</a>
<a href="RM_H5S.html">H5S</a>
<a href="RM_H5T.html">H5T</a>
<a href="RM_H5Z.html">H5Z</a>
<a href="Tools.html">Tools</a>
<a href="PredefDTypes.html">Datatypes</a>
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</table>
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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
<br>
Describes HDF5 Release 1.7, the unreleased development branch; working toward HDF5 Release 1.8.0
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