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<title>Terms Used to Describe Directives - Apache HTTP Server</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.0</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.0</a></div><div id="page-content"><div id="preamble"><h1>Terms Used to Describe Directives</h1>
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<p>This document describes the terms that are used to describe
each Apache <a href="directives.html">configuration
directive</a>.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#Description">Description</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#Syntax">Syntax</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#Default">Default</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#Context">Context</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#Override">Override</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#Status">Status</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#Module">Module</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#Compatibility">Compatibility</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><a href="../configuring.html">Configuration files</a></li></ul></div>
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<div class="section">
<h2><a name="Description" id="Description">Description</a></h2>
<p>A brief description of the purpose of the directive.</p>
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<div class="section">
<h2><a name="Syntax" id="Syntax">Syntax</a></h2>
<p>This indicates the format of the directive as it would
appear in a configuration file. This syntax is extremely
directive-specific, and is described in detail in the
directive's definition. Generally, the directive name is
followed by a series of one or more space-separated arguments.
If an argument contains a space, the argument must be enclosed
in double quotes. Optional arguments are enclosed in square
brackets. Where an argument can take on more than one possible
value, the possible values are separated by vertical bars "|".
Literal text is presented in the default font, while
argument-types for which substitution is necessary are
<em>emphasized</em>. Directives which can take a variable
number of arguments will end in "..." indicating that the last
argument is repeated.</p>
<p>Directives use a great number of different argument types. A
few common ones are defined below.</p>
<dl>
<dt><em>URL</em></dt>
<dd>A complete Uniform Resource Locator including a scheme,
hostname, and optional pathname as in
<code>http://www.example.com/path/to/file.html</code></dd>
<dt><em>URL-path</em></dt>
<dd>The part of a <em>url</em> which follows the scheme and
hostname as in <code>/path/to/file.html</code>. The
<em>url-path</em> represents a web-view of a resource, as
opposed to a file-system view.</dd>
<dt><em>file-path</em></dt>
<dd>The path to a file in the local file-system beginning
with the root directory as in
<code>/usr/local/apache/htdocs/path/to/file.html</code>.
Unless otherwise specified, a <em>file-path</em> which does
not begin with a slash will be treated as relative to the <a href="core.html#serverroot">ServerRoot</a>.</dd>
<dt><em>directory-path</em></dt>
<dd>The path to a directory in the local file-system
beginning with the root directory as in
<code>/usr/local/apache/htdocs/path/to/</code>.</dd>
<dt><em>filename</em></dt>
<dd>The name of a file with no accompanying path information
as in <code>file.html</code>.</dd>
<dt><em>regex</em></dt>
<dd>A Perl-compatible <a href="../glossary.html#regex">regular
expression</a>. The directive definition will specify what the
<em>regex</em> is matching against.</dd>
<dt><em>extension</em></dt>
<dd>In general, this is the part of the <em>filename</em>
which follows the last dot. However, Apache recognizes
multiple filename extensions, so if a <em>filename</em>
contains more than one dot, each dot-separated part of the
filename following the first dot is an <em>extension</em>.
For example, the <em>filename</em> <code>file.html.en</code>
contains two extensions: <code>.html</code> and
<code>.en</code>. For Apache directives, you may specify
<em>extension</em>s with or without the leading dot. In
addition, <em>extension</em>s are not case sensitive.</dd>
<dt><em>MIME-type</em></dt>
<dd>A method of describing the format of a file which
consists of a major format type and a minor format type,
separated by a slash as in <code>text/html</code>.</dd>
<dt><em>env-variable</em></dt>
<dd>The name of an <a href="../env.html">environment
variable</a> defined in the Apache configuration process.
Note this is not necessarily the same as an operating system
environment variable. See the <a href="../env.html">environment variable documentation</a> for
more details.</dd>
</dl>
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<div class="section">
<h2><a name="Default" id="Default">Default</a></h2>
<p>If the directive has a default value (<em>i.e.</em>, if you
omit it from your configuration entirely, the Apache Web server
will behave as though you set it to a particular value), it is
described here. If there is no default value, this section
should say "<em>None</em>". Note that the default listed here
is not necessarily the same as the value the directive takes in
the default httpd.conf distributed with the server.</p>
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<div class="section">
<h2><a name="Context" id="Context">Context</a></h2>
<p>This indicates where in the server's configuration files the
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