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<html>
<head><title>
HDF5 API Specification
</title></head>
<body bgcolor="#FFFFFF">


<hr>
<center>
<table cellspacing=0 cellpadding=0 border=0 width=98%>
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<a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
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<center>
<h1>HDF5: API Specification<br>Reference Manual</h1>

<!-- following line(s) for Fortran90 releases only
     <h3>Released: July 2000</h3>
     <h3>Software based on HDF5 R1.2.2<br>Documentation based on HDF5 R1.2.3 
     (unreleased development version)</h3>
-->

</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>
<i><strong>A note regarding the prototype FORTRAN90 APIs:</strong><br>
This version of the </i>HDF5 Reference Manual<i> includes a description
of a partial FORTRAN90 <strong>prototype</strong> API to HDF5.
Prototype 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>
See <a href="README_Fortran90.txt" target="FortranWin">README_Fortran90.txt</a>,
a copy of the README file in the Fortran prototype source code directory, 
for more detailed notes regarding the prototype API.  </i>
<p>

<center>
<table border=0>

<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">Compression Interface</a>
    </td><td></td><td valign=top>The <strong>H5Z</strong> API for 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="Glossary.html">Glossary</a>
    </td><td></td><td valign=top>A glossary of data-types used in the APIs.
-->
</td></tr>
<tr><td valign=top><hr noshade size=1>Experimental interface:<br><a href="RM_H5RA.html">Ragged Arrays</a>&nbsp;&nbsp;
    </td><td></td><td valign=top><hr noshade size=1><br>The <strong>H5RA</strong> API for ragged arrays.


</td></tr>
</table>
</center>

<br><br>

<hr>
<center>
<table border=0 width=98%>
<tr><td valign=top align=left>
<a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
<a href="H5.user.html">HDF5 User Guide</a>&nbsp;<br>
<a href="index.html">Other HDF5 documents and links</a>&nbsp;<br>
<!--
<a href="Glossary.html">Glossary</a><br>
-->
</td>
<td valign=top align=right>
<!--
And in this document, the 
HDF5 Reference Manual&nbsp;&nbsp;
<br>
<a href="RM_H5.html">H5</a>&nbsp;&nbsp;
<a href="RM_H5A.html">H5A</a>&nbsp;&nbsp;
<a href="RM_H5D.html">H5D</a>&nbsp;&nbsp;
<a href="RM_H5E.html">H5E</a>&nbsp;&nbsp;
<a href="RM_H5F.html">H5F</a>&nbsp;&nbsp;
<a href="RM_H5G.html">H5G</a>&nbsp;&nbsp;
<a href="RM_H5I.html">H5I</a>&nbsp;&nbsp;
<br>
<a href="RM_H5P.html">H5P</a>&nbsp;&nbsp;
<a href="RM_H5R.html">H5R</a>&nbsp;&nbsp;
<a href="RM_H5RA.html">H5RA</a>&nbsp;&nbsp;
<a href="RM_H5S.html">H5S</a>&nbsp;&nbsp;
<a href="RM_H5T.html">H5T</a>&nbsp;&nbsp;
<a href="RM_H5Z.html">H5Z</a>&nbsp;&nbsp;
<a href="Tools.html">Tools</a>&nbsp;&nbsp;
-->
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</table>
</center>
<hr>


<address>
<table width=100% border=0>
<tr><td align=left valign=top>
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a> 
<br>
Last modified:  17 July 2000

</td><td align=right valign=top>
<a href="Copyright.html">Copyright</a>&nbsp;&nbsp;
<br>
Describes HDF5 Version 1.3 (Unrelased development version. Dynamic.)
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