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<h1>Site Tree</h1>
<div id="front-matter">
<div class="abstract">Proposal for a a general framework for management of
navigation for a publication.</div>
<div id="minitoc-area">
<ul class="minitoc">
<li>
<a href="#Motivation">Motivation</a>
</li>
<li>
<a href="#Rationale">Rationale</a>
<ul class="minitoc">
<li>
<a href="#Navigation">Navigation</a>
</li>
<li>
<a href="#Moving+Of+Documents">Moving Of Documents</a>
</li>
<li>
<a href="#Doctype+Querying">Doctype Querying</a>
<ul class="minitoc">
<li>
<a href="#Hashmap">Hashmap</a>
</li>
<li>
<a href="#Forrest+SourceTypeAction">Forrest SourceTypeAction</a>
</li>
<li>
<a href="#URIParametrizer">URIParametrizer</a>
</li>
</ul>
</li>
</ul>
</li>
<li>
<a href="#The+Sitetree+Schema">The Sitetree Schema</a>
</li>
<li>
<a href="#Backwards+Compatibility">Backwards Compatibility</a>
</li>
<li>
<a href="#Roadmap">Roadmap</a>
</li>
<li>
<a href="#Reference+Implementation">Reference Implementation</a>
</li>
</ul>
</div>
</div>
<a name="N10018"></a><a name="Motivation"></a>
<h2 class="h3">Motivation</h2>
<div class="section">
<p>Currently there is no standard way to manage the navigation
in Lenya. Previous attempts have shown their own merits and
drawbacks. A general and standard approach is needed.</p>
</div>
<a name="N10022"></a><a name="Rationale"></a>
<h2 class="h3">Rationale</h2>
<div class="section">
<p>The basic problems we're trying to solve are as follows:</p>
<ol>
<li>Maintain the navigation in an easy format independent of
the actual storage of the documents.</li>
<li>Enable moving of documents.</li>
<li>Enable querying of doctype independent of request URI.</li>
</ol>
<a name="N10037"></a><a name="Navigation"></a>
<h3 class="h4">Navigation</h3>
<p>There are a couple of known implementations to choose from:</p>
<ul>
<li>The existing Lenya tree.xml</li>
<li>The Forrest site.xml.</li>
<li>The hashmap way: A sitetree.xml and purlspace.xml combination
where the purlspace.xml contains all existing documents and
sitetree.xml contains the navigation hierarchy.</li>
</ul>
<a name="N1004D"></a><a name="Moving+Of+Documents"></a>
<h3 class="h4">Moving Of Documents</h3>
<p>The Forrest site.xml solves this quite elegantly: Due to the use of
XPath and some ambiguity the documents can be found almost
independent of their actual location</p>
<p>With the existing Lenya or the hashmap solution changing of document
location requires editing of the tree.xml or the purlspace.xml
respectively.</p>
<a name="N1005A"></a><a name="Doctype+Querying"></a>
<h3 class="h4">Doctype Querying</h3>
<p>For question 3 there are a couple of known approaches:</p>
<a name="N10063"></a><a name="Hashmap"></a>
<h4>Hashmap</h4>
<p>This method uses an action which contains for each
request URI a mapping to attributes such as doctype, srcfile, xslt,
etc.</p>
<a name="N1006D"></a><a name="Forrest+SourceTypeAction"></a>
<h4>Forrest SourceTypeAction</h4>
<p>Forrest contains an action which for a given request
opens the source file and determines its doctype based on the dtd
declaration.</p>
<a name="N10077"></a><a name="URIParametrizer"></a>
<h4>URIParametrizer</h4>
<p>The URIParametrizer is a black box (probably an action)
which internally issues cocoon requests to different sitemaps which
return different attributes (doctype, etc.) for a given request
URI.</p>
<p>This amounts to a combination of the hashmap solution
with the basic cocoon concepts: The request URIs aren't matched
against a hashmap but are handled by a sitemap instead. The sitemap
contains normal pipelines and matchers which match on the
request. As a catch-all there is still the possibility of using a
hashmap for URIs that didn't match any pipelines.</p>
<p>Finally a new (internal) request is generated using the
parameter values. This request is handled by a normal cocoon
sitemap as if the original request had contained these
parameters.</p>
<div id="" style="text-align: center;">
<img id="" class="figure" alt="Diagram of URIParametrizer" src="URIParametrizer.png"></div>
</div>
<a name="N1008D"></a><a name="The+Sitetree+Schema"></a>
<h2 class="h3">The Sitetree Schema</h2>
<div class="section">
<p>The proposed sitetree schema looks as follows:</p>
<pre class="code">
&lt;?xml version="1.0"?&gt;
&lt;xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://apache.org/cocoon/lenya/sitetree/1.0"
xmlns="http://apache.org/cocoon/lenya/sitetree/1.0"
elementFormDefault="qualified"&gt;
&lt;xs:element name="site"&gt;
&lt;xs:complexType&gt;
&lt;xs:sequence&gt;
&lt;xs:element ref="node"
minOccurs="0" maxOccurs="unbounded"/&gt;
&lt;/xs:sequence&gt;
&lt;/xs:complexType&gt;
&lt;/xs:element&gt;
&lt;xs:element name="node"&gt;
&lt;xs:complexType&gt;
&lt;xs:sequence&gt;
&lt;xs:element ref="node"
minOccurs="0" maxOccurs="unbounded"/&gt;
&lt;/xs:sequence&gt;
&lt;xs:attribute name="href" type="xs:string"/&gt;
&lt;xs:attribute name="label" type="xs:string"/&gt;
&lt;/xs:complexType&gt;
&lt;/xs:element&gt;
&lt;/xs:schema&gt;
</pre>
<p>
An example <span class="codefrag">sitetree.xml</span> could look like follows:
</p>
<pre class="code">
&lt;site
xmlns="http://apache.org/cocoon/lenya/sitetree/1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=
"http://apache.org/cocoon/lenya/sitetree/1.0
../../../../resources/entities/sitetree.xsd"&gt;
&lt;node href="index.html" label="Home"/&gt;
&lt;node href="demo/" label="Demo"&gt;
&lt;node href="unipublic.html" label="Unipublic"/&gt;
&lt;node href="news.html" label="Wyona News and Comments"/&gt;
&lt;node href="oscom.html" label="OSCOM"/&gt;
&lt;/node&gt;
&lt;node href="download/" label="Download"&gt;
&lt;node href="source.html" label="Source Version"/&gt;
&lt;node href="binary.html" label="Binary Version"/&gt;
&lt;/node&gt;
&lt;node href="documentation/" label="Documentation"/&gt;
&lt;/site&gt;
</pre>
</div>
<a name="N100A5"></a><a name="Backwards+Compatibility"></a>
<h2 class="h3">Backwards Compatibility</h2>
<div class="section">
<p>There has not been a previous implementation, so this is a non-issue.</p>
</div>
<a name="N100AF"></a><a name="Roadmap"></a>
<h2 class="h3">Roadmap</h2>
<div class="section">
<ul>
<li>Decide which solution to choose</li>
</ul>
</div>
<a name="N100BC"></a><a name="Reference+Implementation"></a>
<h2 class="h3">Reference Implementation</h2>
<div class="section">
<p>None</p>
</div>
<span class="version">
v0.1Initial version</span>
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