Tuesday, March 04, 2008

grokSeeAlso

Here's a quick and dirty transformation which looks for //link[@rel="alternate" and @type="application/rdf+xml"]

It simply adds in an rdfs:seeAlso, but that should be enough!

Lives at SVN, see the grddl results

<?xml-stylesheet href="http://www.w3.org/StyleSheets/base.css" type="text/css"?>
<?xml-stylesheet href="http://www.w3.org/2002/02/style-xsl.css" type="text/css"?>


<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:html="http://www.w3.org/1999/xhtml"
xmlns:rdf ="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs ="http://www.w3.org/2000/01/rdf-schema#"
xmlns:dataview="http://www.w3.org/2003/g/data-view#"
exclude-result-prefixes="html">


<xsl:output method="xml" encoding="utf-8" indent="yes"/>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="http://www.w3.org/StyleSheets/base"/>
<title>Extracting alternative application/rdf+xml descriptions</title>

</head>
<body>
<h1>Extracting alternative application/rdf+xml descriptions</h1>


<p>This is a <a href="http://www.w3.org/TR/grddl">GRDDL</a> transformation that produces a list of RDF alternative descriptions from XHTML.
Each link (<code>link</code> or <code>a</code>) with a <code>rel</code> attribute whose value includes <code>alternate</code> or <code>meta</code> and <code>type</code> whose value is <code>application/rdf+xml</code> is used to identify alternative resources which describe the source document.
</p>

<p>In the following example, written in XHTML, the <code>link</code>

element is a link by HTML conventions:</p>

<pre class="example"><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://www.w3.org/2003/g/data-view">
<link rel="alternate"
href="http://danbri.org/foaf.rdf" />
...
<p>Here's a link to my other
<a rel="alternate" type="application/rdf+xml"
href="http://danbri.org/words/feed/rdf">RSS 1.0 data</a>
</pre>

<p>
This transform is based on <a href="http://www.w3.org/2003/g/glean-profile">glean-profile.xsl</a>, which is copyright, 2005-2007, W3C.
It is available for use under the terms of the
<a href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">W3C Software License</a>
</p>

</body>
</html>

<xsl:template match="/">
<rdf:RDF>
<xsl:for-each select="/html:html//html:*//
html:*
[self::html:a or self::html:link]
[@href and (contains(@rel,'meta') or contains(@rel,'alternate'))
and
contains(@type,'application/rdf+xml')
]">
<rdf:Description rdf:about=''>
<rdfs:seeAlso rdf:resource="{@href}" />
</rdf:Description>
</xsl:for-each>
</rdf:RDF>
</xsl:template>

</xsl:stylesheet>
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