SparqPlug

The "SparqPlug" RDFizing service converts the XHTML DOM into an RDF graph which can be queried with SPARQL to extract the required/desired data, which (if we use CONSTRUCT queries) is then available as a nice neat bit of RDF/XML according to whichever vocabs/ontologies we choose, ready for use in some other application.

There are full technical details of the approach in the paper http://events.linkeddata.org/ldow2008/papers/05-coetzee-heath-sparqplug.pdf from the upcoming Linked Data on the Web workshop at WWW2008, and the live SparqPlug service is at http://sparqplug.rdfize.com/