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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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+
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta name="generator" content="HTML Tidy, see www.w3.org" />
+
+ <title>Definitions of terms used to describe Apache
+ directives</title>
+ </head>
+ <!-- Background white, links blue (unvisited), navy (visited), red (active) -->
+
+ <body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
+ vlink="#000080" alink="#FF0000">
+ <div align="CENTER">
+ <img src="../images/sub.gif" alt="[APACHE DOCUMENTATION]" />
+
+ <h3>Apache HTTP Server Version 1.3</h3>
+ </div>
+
+
+ <h1 align="CENTER">Terms Used to Describe Apache
+ Directives</h1>
+
+ <p>Each Apache configuration directive is described using a
+ common format that looks like this:</p>
+
+ <dl>
+ <dd><a href="#Syntax" rel="Help"><strong>Syntax:</strong></a>
+ <em>directive-name</em> <em>some args</em><br />
+ <a href="#Default" rel="Help"><strong>Default:</strong></a>
+ <samp><em>directive-name default-value</em></samp><br />
+ <a href="#Context" rel="Help"><strong>Context:</strong></a>
+ <em>context-list</em><br />
+ <a href="#Override"
+ rel="Help"><strong>Override:</strong></a>
+ <em>override</em><br />
+ <a href="#Status" rel="Help"><strong>Status:</strong></a>
+ <em>status</em><br />
+ <a href="#Module" rel="Help"><strong>Module:</strong></a>
+ <em>module-name</em><br />
+ <a href="#Compatibility"
+ rel="Help"><strong>Compatibility:</strong></a>
+ <em>compatibility notes</em></dd>
+ </dl>
+
+ <p>Each of the directive's attributes, complete with possible
+ values where possible, are described in this document.</p>
+
+ <h2>Directive Terms</h2>
+
+ <ul>
+ <li><a href="#Syntax">Syntax</a></li>
+
+ <li><a href="#Default">Default</a></li>
+
+ <li><a href="#Context">Context</a></li>
+
+ <li><a href="#Override">Override</a></li>
+
+ <li><a href="#Status">Status</a></li>
+
+ <li><a href="#Module">Module</a></li>
+
+ <li><a href="#Compatibility">Compatibility</a></li>
+ </ul>
+ <hr />
+
+ <h2><a id="Syntax" name="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 <a href="../misc/FAQ.html#regex">regular
+ expression</a>, which is a way of describing a pattern to
+ match in text. 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>
+ <hr />
+
+ <h2><a id="Default" name="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>
+ <hr />
+
+ <h2><a id="Context" name="Context">Context</a></h2>
+
+ <p>This indicates where in the server's configuration files the
+ directive is legal. It's a comma-separated list of one or more
+ of the following values:</p>
+
+ <dl>
+ <dt><strong>server config</strong></dt>
+
+ <dd>This means that the directive may be used in the server
+ configuration files (<em>e.g.</em>, <samp>httpd.conf</samp>,
+ <samp>srm.conf</samp>, and <samp>access.conf</samp>), but
+ <strong>not</strong> within any
+ <samp>&lt;VirtualHost&gt;</samp> or &lt;Directory&gt;
+ containers. It is not allowed in <samp>.htaccess</samp> files
+ at all.</dd>
+
+ <dt><strong>virtual host</strong></dt>
+
+ <dd>This context means that the directive may appear inside
+ <samp>&lt;VirtualHost&gt;</samp> containers in the server
+ configuration files.</dd>
+
+ <dt><strong>directory</strong></dt>
+
+ <dd>A directive marked as being valid in this context may be
+ used inside <samp>&lt;Directory&gt;</samp>,
+ <samp>&lt;Location&gt;</samp>, and <samp>&lt;Files&gt;</samp>
+ containers in the server configuration files, subject to the
+ restrictions outlined in <a href="../sections.html">How
+ Directory, Location and Files sections work</a>.</dd>
+
+ <dt><strong>.htaccess</strong></dt>
+
+ <dd>If a directive is valid in this context, it means that it
+ can appear inside <em>per</em>-directory
+ <samp>.htaccess</samp> files. It may not be processed, though
+ depending upon the <a href="#Override"
+ rel="Help">overrides</a> currently active.</dd>
+ </dl>
+
+ <p>The directive is <em>only</em> allowed within the designated
+ context; if you try to use it elsewhere, you'll get a
+ configuration error that will either prevent the server from
+ handling requests in that context correctly, or will keep the
+ server from operating at all -- <em>i.e.</em>, the server won't
+ even start.</p>
+
+ <p>The valid locations for the directive are actually the
+ result of a Boolean OR of all of the listed contexts. In other
+ words, a directive that is marked as being valid in
+ "<samp>server config, .htaccess</samp>" can be used in the
+ <samp>httpd.conf</samp> file and in <samp>.htaccess</samp>
+ files, but not within any &lt;Directory&gt; or
+ &lt;VirtualHost&gt; containers.</p>
+ <hr />
+
+ <h2><a id="Override" name="Override">Override</a></h2>
+
+ <p>This directive attribute indicates which configuration
+ override must be active in order for the directive to be
+ processed when it appears in a <samp>.htaccess</samp> file. If
+ the directive's <a href="#Context" rel="Help">context</a>
+ doesn't permit it to appear in <samp>.htaccess</samp> files,
+ this attribute should say "<em>Not applicable</em>".</p>
+
+ <p>Overrides are activated by the <a
+ href="core.html#allowoverride"
+ rel="Help"><samp>AllowOverride</samp></a> directive, and apply
+ to a particular scope (such as a directory) and all
+ descendants, unless further modified by other
+ <samp>AllowOverride</samp> directives at lower levels. The
+ documentation for that directive also lists the possible
+ override names available.</p>
+ <hr />
+
+ <h2><a id="Status" name="Status">Status</a></h2>
+
+ <p>This indicates how tightly bound into the Apache Web server
+ the directive is; in other words, you may need to recompile the
+ server with an enhanced set of modules in order to gain access
+ to the directive and its functionality. Possible values for
+ this attribute are:</p>
+
+ <dl>
+ <dt><strong>Core</strong></dt>
+
+ <dd>If a directive is listed as having "Core" status, that
+ means it is part of the innermost portions of the Apache Web
+ server, and is always available.</dd>
+
+ <dt><strong>Base</strong></dt>
+
+ <dd>A directive labeled as having "Base" status is supported
+ by one of the standard Apache modules which is compiled into
+ the server by default, and is therefore normally available
+ unless you've taken steps to remove the module from your
+ configuration.</dd>
+
+ <dt><strong>Extension</strong></dt>
+
+ <dd>A directive with "Extension" status is provided by one of
+ the modules included with the Apache server kit, but the
+ module isn't normally compiled into the server. To enable the
+ directive and its functionality, you will need to change the
+ server build configuration files and re-compile Apache.</dd>
+
+ <dt><strong>Experimental</strong></dt>
+
+ <dd>"Experimental" status indicates that the directive is
+ available as part of the Apache kit, but you're on your own
+ if you try to use it. The directive is being documented for
+ completeness, and is not necessarily supported. The module
+ which provides the directive may or may not be compiled in by
+ default; check the top of the page which describes the
+ directive and its module to see if it remarks on the
+ availability.</dd>
+ </dl>
+ <hr />
+
+ <h2><a id="Module" name="Module">Module</a></h2>
+
+ <p>This quite simply lists the name of the source module which
+ defines the directive.</p>
+ <hr />
+
+ <h2><a id="Compatibility"
+ name="Compatibility">Compatibility</a></h2>
+
+ <p>If the directive wasn't part of the original Apache version
+ 1 distribution, the version in which it was introduced should
+ be listed here. If the directive has the same name as one from
+ the NCSA HTTPd server, any inconsistencies in behavior between
+ the two should also be mentioned. Otherwise, this attribute
+ should say "<em>No compatibility issues.</em>"</p>
+ <hr />
+
+ <h3 align="CENTER">Apache HTTP Server Version 1.3</h3>
+ <a href="./"><img src="../images/index.gif" alt="Index" /></a>
+ <a href="../"><img src="../images/home.gif" alt="Home" /></a>
+
+ </body>
+</html>
+
+
+