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<div id="projectname"><a href="https://www.hdfgroup.org">HDF5</a>
 <span id="projectnumber">1.15.0.68e8c0e</span>
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<div id="projectbrief">API Reference</div>
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<div class="textblock"><h1><a class="anchor" id="about_history"></a>
History</h1>
<p>The implementation of this documentation set is based on the fantastic work of the <a href="https://eigen.tuxfamily.org/index.php?title=Main_Page">Eigen project</a>. Please refer to their <a href="https://gitlab.com/libeigen/eigen">GitLab repository</a> and the online version of their <a href="http://eigen.tuxfamily.org/dox/">Doxygen-based documentation</a>. Not only does Eigen set a standard as a piece of software, but also as an example of <em>documentation done right</em>.</p>
<h1><a class="anchor" id="about_documentation"></a>
Documentation about Documentation</h1>
<p>In this section, we describe common documentation maintenance tasks.</p>
<h2><a class="anchor" id="plain_html"></a>
Including Plain HTML Pages</h2>
<p>The most common use case for this is the inclusion of older documentation. New documentation should, whenever possible, be created using Doxygen markdown!</p>
<p>Use Doxygen's <a href="https://www.doxygen.nl/manual/commands.html#cmdhtmlinclude"><code>htmlinclude</code></a> special command to include existing plain HTML pages.</p>
<p>An example from this documentation set can be seen <a href="https://github.com/HDFGroup/hdf5/blob/develop/doxygen/dox/FileFormatSpec.dox">here</a>.</p>
<h2><a class="anchor" id="new_rm_entry"></a>
Creating a New Reference Manual Entry</h2>
<p>Please refer to the <a class="el" href="_r_m_t.html">Reference Manual (RM) Page Template</a> for guidance on how to create a new reference manual entry.</p>
<h3><a class="anchor" id="new_example"></a>
Adding and Referencing API Examples</h3>
<p>For each HDF5 module, such as <code>H5F</code>, there is an examples source file called <code>H5*_examples.c</code>. For example, the <code>H5F</code> API examples are located in <a href="https://github.com/HDFGroup/hdf5/blob/develop/doxygen/examples/H5F_examples.c"><code>H5F_examples.c</code></a>. Examples are code blocks marked as Doxygen <a href="https://www.doxygen.nl/manual/commands.html#cmdsnippet">snippets</a>. For example, the source code for the <a class="el" href="group___h5_f.html#gae64b51ee9ac0781bc4ccc599d98387f4" title="Creates an HDF5 file.">H5Fcreate()</a> API sample is located between the </p><pre class="fragment">//! <!-- [create] -->
...
//! <!-- [create] -->
</pre><p> comments in <a href="https://github.com/HDFGroup/hdf5/blob/develop/doxygen/examples/H5F_examples.c"><code>H5F_examples.c</code></a>.</p>
<p>Add a new API example by adding a new code block enclosed between matching snippet tags. The name of the tag is usually the function name stripped of the module prefix.</p>
<p>The inclusion of such a block of code can then be triggered via Doxygen's <a href="https://www.doxygen.nl/manual/commands.html#cmdsnippet"><code>snippet</code></a> special command. For example, the following markup </p><pre class="fragment">* \snippet H5F_examples.c create
</pre><p> yields </p><div class="fragment"><div class="line"> {</div>
<div class="line"> __label__ fail_fapl, fail_fcpl, fail_file;</div>
<div class="line"> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> fcpl, fapl, file;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((fcpl = <a class="code hl_function" href="group___p_l_c_r.html#gaf1b11da01d4d45d788c45f8bc5f0cbfa">H5Pcreate</a>(<a class="code hl_define" href="_h5_ppublic_8h.html#a206f334f1e6c973e1215a3148b45b977">H5P_FILE_CREATE</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_fcpl;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span> {</div>
<div class="line"> <span class="comment">// adjust the file creation properties</span></div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((fapl = <a class="code hl_function" href="group___p_l_c_r.html#gaf1b11da01d4d45d788c45f8bc5f0cbfa">H5Pcreate</a>(<a class="code hl_define" href="_h5_ppublic_8h.html#a60ec2d4334addfc0eda89614598ee38e">H5P_FILE_ACCESS</a>)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_fapl;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span> {</div>
<div class="line"> <span class="comment">// adjust the file access properties</span></div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordtype">unsigned</span> mode = <a class="code hl_define" href="_h5_fpublic_8h.html#a7a47250dc1435705233dca7297ba3d90">H5F_ACC_EXCL</a>;</div>
<div class="line"> <span class="keywordtype">char</span> name[] = <span class="stringliteral">"f1.h5"</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gae64b51ee9ac0781bc4ccc599d98387f4">H5Fcreate</a>(name, mode, fcpl, fapl)) == <a class="code hl_define" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>) {</div>
<div class="line"> ret_val = EXIT_FAILURE;</div>
<div class="line"> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// do something useful with FILE</span></div>
<div class="line"> </div>
<div class="line"> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line">fail_file:</div>
<div class="line"> <a class="code hl_function" href="group___p_l_c_r.html#ga5dce61149211d3ef319452aa598887fb">H5Pclose</a>(fapl);</div>
<div class="line">fail_fapl:</div>
<div class="line"> <a class="code hl_function" href="group___p_l_c_r.html#ga5dce61149211d3ef319452aa598887fb">H5Pclose</a>(fcpl);</div>
<div class="line">fail_fcpl:;</div>
<div class="line"> }</div>
</div><!-- fragment --><h3><a class="anchor" id="api_macro"></a>
Adding an API Macro</h3>
<p>API macros are handled by the <code>api_vers_2, api_vers_3, api_vers_4</code> custom commands. The numbers indicate the number of potential API function mappings. For example, <a class="el" href="group___h5_a.html#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate()</a> has two potential mappings, <a class="el" href="group___h5_a.html#gaa30f5f6c277d6c46f8aa31e89cdba085" title="Creates an attribute attached to a specified object.">H5Acreate1()</a> and <a class="el" href="group___h5_a.html#ga4f4e5248c09f689633079ed8afc0b308" title="Creates an attribute attached to a specified object.">H5Acreate2()</a>. To trigger the creation of a reference manual entry for <a class="el" href="group___h5_a.html#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate()</a> use the following markup: </p><pre class="fragment">\api_vers_2{H5Acreate,H5Acreate1,H5Acreate2}
</pre><p> This yields:</p>
<p><a class="el" href="group___h5_a.html#ga4a76e4e5ab6eb0fd2aa7990d38d55f24">H5Acreate()</a> is a macro that is mapped to either <a class="el" href="group___h5_a.html#gaa30f5f6c277d6c46f8aa31e89cdba085" title="Creates an attribute attached to a specified object.">H5Acreate1()</a> or <a class="el" href="group___h5_a.html#ga4f4e5248c09f689633079ed8afc0b308" title="Creates an attribute attached to a specified object.">H5Acreate2()</a>.<br />
</p><dl class="section see"><dt>See also</dt><dd><a class="el" href="api-compat-macros.html">API Compatibility Macros</a></dd></dl>
<h2><a class="anchor" id="custom_commands"></a>
Creating Custom Commands</h2>
<p>See Doxygen's <a href="https://www.doxygen.nl/manual/custcmd.html">Custom Commands documentation</a> as a general reference.</p>
<p>All custom commands for this project are located in the <a href="https://github.com/HDFGroup/hdf5/blob/develop/doxygen/aliases"><code>aliases</code></a> file in the <a href="https://github.com/HDFGroup/hdf5/tree/develop/doxygen"><code>doxygen</code></a> subdirectory of the <a href="https://github.com/HDFGroup/hdf5">main HDF5 repo</a>.</p>
<p>The custom commands are grouped in sections. Find a suitable section for your command or ask for help if unsure!</p>
<h2><a class="anchor" id="new_rfc"></a>
Adding a New RFC or Referencing an Existing RFC</h2>
<p>For ease of reference, we define custom commands for each RFC in the <code>RFCs</code> section of the <a href="https://github.com/HDFGroup/hdf5/blob/develop/doxygen/aliases"><code>aliases</code></a> file. For example the custom command <code>ref_rfc20141210</code> can be used to insert a reference to "RFC: Virtual Object Layer". In other words, the markup </p><pre class="fragment">\ref_rfc20141210
</pre><p> yields a clickable link:</p>
<p><a href="https://docs.hdfgroup.org/hdf5/rfc/HDF5-VDS-requirements-use-cases-2014-12-10.pdf">HDF5 Virtual Dataset</a></p>
<p>To add a new RFC, add a custom command for the RFC to the <a href="https://github.com/HDFGroup/hdf5/blob/develop/doxygen/aliases"><code>aliases</code></a> file. The naming convention for the custom command is <code>ref_rfcYYYYMMDD</code>, where <code>YYYYMMDD</code> is the ID of the RFC. The URL is composed of the prefix </p><pre class="fragment">https://docs.hdfgroup.org/hdf5/rfc/
</pre><p> and the name of your RFC file, typically, a PDF file, i.e., the full URL would be </p><pre class="fragment">https://docs.hdfgroup.org/hdf5/rfc/my_great_rfc_name.pdf
</pre><h2><a class="anchor" id="hosting"></a>
How Do Updates and Changes Get Published?</h2>
<p>Currently, the files underlying this documentation website are stored in an bucket on AWS S3. The top-level bucket is </p><pre>s3://docs.hdfgroup.org/hdf5/</pre><p> There are folders for the <code>development</code> branch and all supported release version.</p>
<p>Talk to your friendly IT-team if you need write access, or you need someone to push an updated version for you! </p>
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