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 <h1>Meta Data</h1>
 <div id="front-matter">
 <div id="minitoc-area">
 <ul class="minitoc">
 <li>
 <a href="#Introduction">Introduction</a>
 </li>
 <li>
 <a href="#Implementation">Implementation</a>
 <ul class="minitoc">
 <li>
 <a href="#Create+Meta+Data">Create Meta Data</a>
 </li>
 <li>
 <a href="#Display+Meta+Data">Display Meta Data</a>
 </li>
 <li>
 <a href="#Modify+Meta+data">Modify Meta data</a>
 </li>
 </ul>
 </li>
 <li>
 <a href="#Involved+classes%2C+XSPs+and+XSLTs">Involved classes, XSPs and XSLTs</a>
 </li>
 </ul>
 </div>
 </div>


 <a name="N1000E"></a><a name="Introduction"></a>
 <h2 class="h3">Introduction</h2>
 <div class="section">
 <p>Meta data is kept directly inside the xml document. It is
       based on the <a href="http://dublincore.org">Dublin Core</a>
       standard.</p>
 <p>There are basically three use cases:</p>
 <ol>

 <li>Create Meta Data</li>

 <li>Display Meta Data</li>

 <li>Modify Meta Data</li>

 </ol>
 </div>


 <a name="N1002B"></a><a name="Implementation"></a>
 <h2 class="h3">Implementation</h2>
 <div class="section">
 <p></p>
 <a name="N10033"></a><a name="Create+Meta+Data"></a>
 <h3 class="h4">Create Meta Data</h3>
 <p>Upon creation of a document a sample is copied from the
 	sample doctype directory. This sample already contains some
 	sample meta data. The creator then applies an XSLT
 	transformation to this sample which adapts the sample values
 	to the values suplied in the creator request. This values are
 	partially filled in by the user (subject, desciption, etc.)
 	and partly by the system (creator, creation data). This is
 	done in the <span class="codefrag">create</span> ant task which at the end
 	invokes an xslt task which applies the
 	<span class="codefrag">addMetaData.xsl</span> stylesheet which adapts the meta
 	data according to the request values.</p>
 <a name="N10043"></a><a name="Display+Meta+Data"></a>
 <h3 class="h4">Display Meta Data</h3>
 <p>The display of meta data is handled by the <span class="codefrag">meta.xsp</span> xsp.</p>
 <a name="N10050"></a><a name="Modify+Meta+data"></a>
 <h3 class="h4">Modify Meta data</h3>
 <p>The modification of meta data is handled in the
 	<span class="codefrag">info.xmap</span> sitemap. The matcher makes sure to
 	check the document out before the modification and checking it
 	back in after the modification. This is done using the
 	<span class="codefrag">ReservedCheckoutTestAction</span> and
 	<span class="codefrag">ReservedCheckinAction</span>.  If there is an error the
 	request is redirected to the meta data screen which displays a
 	warning saying that the checkout or checkin failed and who was
 	locking the document since what date and time.</p>
 <p>Once the document is checked out the modifications are
 	applied with the help of an ant task. There is a target named
 	<span class="codefrag">save-meta-data</span> which simply invokes the ant task
 	<span class="codefrag">WriteDCParametersTask</span>.  This task saves the meta
 	data using the <span class="codefrag">DublinCore</span> interface.</p>
 </div>


 <a name="N10070"></a><a name="Involved+classes%2C+XSPs+and+XSLTs"></a>
 <h2 class="h3">Involved classes, XSPs and XSLTs</h2>
 <div class="section">
 <p>The following classes, XSPs and XSLTs are involved in meta
       data handling:</p>
 <dl>

 <dt>org.apache.lenya.cms.ant.WriteDCParametersTask</dt>

 <dd>A simple ant task which saves the meta data which is
 	  passed as arguments to file using the
 	<span class="codefrag">DublinCore</span> class.</dd>

 <dt>$publication-id/config/tasks/targets.xml</dt>

 <dd>Defines the <span class="codefrag">save-meta-data</span> target which
 	handles saving of meta data with the help of the
 	<span class="codefrag">WriteDCParametersTask</span> ant task. Also defines
 	the <span class="codefrag">create</span> target which is used create new
 	documents and to change the meta data according to the request
 	values from the creation request.</dd>

 <dt>org.apache.lenya.cms.publication.DublinCore</dt>

 <dd>A simple interface to save and retrieve dublin core meta
 	data.</dd>

 <dt>org.apache.lenya.cms.cocoon.acting.ReservedCheckoutTestAction</dt>

 <dd>Action that tests if a document can be checked out and if
 	yes does check it out (See <a href="../revisioncontrol/revisioncontroller.html">Revision Controller</a>).</dd>

 <dt>org.apache.lenya.cms.cocoon.acting.ReservedCheckinAction</dt>

 <dd>Action that checks a document in (See <a href="../revisioncontrol/revisioncontroller.html">Revision Controller</a>).</dd>

 <dt>src/webapp/lenya/content/info/meta.xsp, src/webapp/lenya/xslt/info/info.xsl</dt>

 <dd>Handle the display of the meta data in the info area. This
 	is also a form which can be used to modify the meta data via a
 	POST request.</dd>

 <dt>src/webapp/lenya/xslt/authoring/addMetaData.xsl</dt>

 <dd>Simple XSLT stylesheet that modifies the meta data
 	according to the input parameters.</dd>

 </dl>
 </div>

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