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  <div class="section" id="captcha-plugin-architecture">
<h1>Captcha Plugin Architecture<a class="headerlink" href="#captcha-plugin-architecture" title="Permalink to this headline">ΒΆ</a></h1>
<p>This document contains design notes for the plone.app.discussion Captcha plugin
architecture. It also explains how to write your own Captcha plugin (???).</p>
<p>Currently there are two plugins that work with plone.app.discussion:</p>
<blockquote>
<ol class="arabic simple">
<li>plone.formwidget.captcha</li>
<li>plone.formwidget.recaptcha</li>
</ol>
</blockquote>
<ol class="arabic simple">
<li>Captcha plugin must provide the feature &#8220;plone.app.discussion-captcha&#8221;:</li>
</ol>
<p>Add this to your configure.zcml:</p>
<div class="highlight-python"><pre>&lt;configure ...
    xmlns:meta="http://namespaces.zope.org/meta"&gt;
    &lt;!-- Declare that plone.formwidget.captcha provides a Captcha field that
         can be used by plone.app.discussion to add a Captcha field to comment
         forms. --&gt;
    &lt;meta:provides feature="plone.app.discussion-captcha" /&gt;

    ...
&lt;/configure&gt;</pre>
</div>
<p>For examples have a look at plone.formwidget.captcha</p>
<p><a class="reference external" href="https://svn.plone.org/svn/plone/plone.formwidget.captcha/trunk/plone/formwidget/captcha/configure.zcml">https://svn.plone.org/svn/plone/plone.formwidget.captcha/trunk/plone/formwidget/captcha/configure.zcml</a></p>
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