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    <title>Definitions of terms used to describe Apache
    modules</title>
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      <h3>Apache HTTP Server Version 2.0</h3>
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    <h1 align="CENTER">Terms Used to Describe Apache Modules</h1>

    <p>Each Apache module is described using a common format that
    looks like this:</p>

    <dl>
      <dd><a href="#Status" rel="Help"><strong>Status:</strong></a>
      <em>status</em><br />
       <a href="#SourceFile" rel="Help"><strong>Source
      File:</strong></a> <em>source-file</em><br />
       <a href="#ModuleIdentifier" rel="Help"><strong>Module
      Identifier:</strong></a> <em>module-identifier</em><br />
       <a href="#Compatibility"
      rel="Help"><strong>Compatibility:</strong></a>
      <em>compatibility notes</em></dd>
    </dl>

    <p>Each of the attributes, complete with values where possible,
    are described in this document.</p>

    <h2>Module Terms</h2>

    <ul>
      <li><a href="#Status">Status</a></li>

      <li><a href="#SourceFile">Source File</a></li>

      <li><a href="#ModuleIdentifier">Module Identifier</a></li>

      <li><a href="#Compatibility">Compatibility</a></li>
    </ul>
    <hr />

    <h2><a id="Status" name="Status">Status</a></h2>

    <p>This indicates how tightly bound into the Apache Web server
    the module is; in other words, you may need to recompile the
    server in order to gain access to the module and its
    functionality. Possible values for this attribute are:</p>

    <dl>
      <dt><strong>MPM</strong></dt>

      <dd>A module with status "MPM" is a <a
      href="../mpm.html">Multi-Processing Module</a>. Unlike the
      other types of modules, Apache must have one and only one MPM
      in use at any time. This type of module is responsible for
      basic request handling and dispatching.</dd>

      <dt><strong>Base</strong></dt>

      <dd>A module labeled as having "Base" status is compiled and
      loaded into the server by default, and is therefore normally
      available unless you have taken steps to remove the module
      from your configuration.</dd>

      <dt><strong>Extension</strong></dt>

      <dd>A module with "Extension" status is not normally compiled
      and loaded into the server. To enable the module and its
      functionality, you may need to change the server build
      configuration files and re-compile Apache.</dd>

      <dt><strong>Experimental</strong></dt>

      <dd>"Experimental" status indicates that the module is
      available as part of the Apache kit, but you are on your own
      if you try to use it. The module is being documented for
      completeness, and is not necessarily supported.</dd>

      <dt><strong>External</strong></dt>

      <dd>Modules which are not included with the base Apache
      distribution ("third-party modules") may use the "External"
      status. We are not responsible for, nor do we support such
      modules.</dd>
    </dl>
    <hr />

    <h2><a id="SourceFile" name="SourceFile">Source File</a></h2>

    <p>This quite simply lists the name of the source file which
    contains the code for the module. This is also the name used by
    the <a
    href="core.html#ifmodule"><code>&lt;IfModule&gt;</code></a>
    directive.</p>
    <hr />

    <h2><a id="ModuleIdentifier" name="ModuleIdentifier">Module
    Identifier</a></h2>

    <p>This is a string which identifies the module for use in the
    <a href="mod_so.html#loadmodule">LoadModule</a> directive when
    dynamically loading modules. In particular, it is the name of
    the external variable of type module in the source file.</p>
    <hr />

    <h2><a id="Compatibility"
    name="Compatibility">Compatibility</a></h2>

    <p>If the module was not part of the original Apache version 2
    distribution, the version in which it was introduced should be
    listed here.</p>
        <hr />

    <h3 align="center">Apache HTTP Server Version 2.0</h3>
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