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<head><title>
HDF5 API Specification
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<h1>HDF5: API Specification<br>Reference Manual</h1>


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The HDF5 library provides several interfaces, each of which provides the 
tools required to meet specific aspects of the HDF5 data-handling requirements.
<p>
See <a href="#F90andCPPlus">below</a> for the FORTRAN90 and C++ APIs.
<p>

<center>
<table border=0 width=90%>

<tr><td valign=top><a href="RM_H5.html">Library Functions</a>
    </td><td>&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>The general-purpose <strong>H5</strong> functions.
</td></tr>
<tr><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><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><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><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><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><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><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><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><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><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><a href="RM_H5Z.html">Filters and</a><br>
                                        &nbsp;&nbsp;<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><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><a href="PredefDTypes.html">Predefined Datatypes</a>
    </td><td></td><td valign=top>Predefined datatypes in HDF5.
<!--
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    </td><td></td><td valign=top>A glossary of data-types used in the APIs.
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<a name="F90andCPPlus">
<hr>
<p align=right>To top of <a href="#TopofRM"><cite>Reference Manual</cite></a>.
<h3>The Fortran90 and C++ APIs to HDF5</h3>
</a>

The HDF5 Library distribution now includes FORTRAN90 and C++ APIs.
These APIs 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>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 
    a description of the FORTRAN90 API to HDF5.
    Fortran subroutines exist in the H5A, H5D, H5E, H5F, H5G, H5I, H5P, 
    H5R, H5S, and H5T interfaces and are described on those pages.
    <p>  
    In general, each Fortran subroutine performs exactly the same task 
    as the corresponding C function.  The links at the top of each reference 
    manual section go to the C function descriptions, which serve as general 
    descriptions for both the C and Fortran APIs.  A button, under 
    <strong>Non-C API(s)</strong> at the end of the C function description,
    opens an external browser window displaying the Fortran-specific 
    information.  You will probably want to adjust the size and location of 
    this external window so that both browser windows are visible and to 
    facilitate moving easily between them.
    <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>


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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a> 
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Describes HDF5 Release 1.6.0, July 2003
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Last modified: 9 April 2003 

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