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<span id="id1"></span><h1>Glossary<a class="headerlink" href="#glossary" title="Permalink to this headline">ΒΆ</a></h1>
<dl class="glossary docutils">
<dt id="term-component">component</dt>
<dd>A part of a URL delimited by slashes. The URL “/help/about” contains
two components: “help” and “about”.</dd>
<dt id="term-generation">generation</dt>
<dd>The act of creating a URL based on a route name and/or variable values.
This is the opposite of matching. Finding a route by name is called
<em>named generation</em>. Finding a route without specifying a name is
called <em>nameless generation</em>.</dd>
<dt id="term-mapper">mapper</dt>
<dd>A container for routes. There is normally one mapper per application,
although nested subapplications might have their own mappers. A
mapper knows how to match routes and generate them.</dd>
<dt id="term-matching">matching</dt>
<dd>The act of matching a given URL against a list of routes, and
returning the routing variables. See the <em>route</em> entry for an example.</dd>
<dt id="term-minimization">minimization</dt>
<dd>A deprecated feature which allowed short URLs to match long paths.
Details are in the <tt class="docutils literal"><span class="pre">Backward</span> <span class="pre">Compatibility</span></tt> section in the manual.</dd>
<dt id="term-route">route</dt>
<dd><p class="first">A rule mapping a URL pattern to a dict of routing variables. For
instance, if the pattern is “/{controller}/{action}” and the requested
URL is “/help/about”, the resulting dict would be:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="p">{</span><span class="s">"controller"</span><span class="p">:</span> <span class="s">"help"</span><span class="p">,</span> <span class="s">"action"</span><span class="p">:</span> <span class="s">"about"</span><span class="p">}</span>
</pre></div>
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<p>Routes does not know what these variables mean; it simply returns them
to the application. Pylons would look for a <tt class="docutils literal"><span class="pre">controllers/help.py</span></tt>
module containing a <tt class="docutils literal"><span class="pre">HelpController</span></tt> class, and call its <tt class="docutils literal"><span class="pre">about</span></tt>
method. Other frameworks may do something different.</p>
<p class="last">A route may have a name, used to identify the route.</p>
</dd>
<dt id="term-route-path">route path</dt>
<dd>The URL pattern in a route.</dd>
<dt id="term-routing-variables">routing variables</dt>
<dd><p class="first">A dict of key-value pairs returned by matching. Variables defined in
the route path are called <em>path variables</em>; their values will be taken
from the URL. Variables defined outside the route path are called
<em>default variables</em>; their values are not affected by the URL.</p>
<p class="last">The WSGI.org environment key for routing variables is
“wsgiorg.routing_args”. This manual does not use that term because it
can be confused with function arguments.</p>
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