Embedded RDF HTML Profile

A GRDDL-capable client tool, when visiting a page which contains the profile reference http://purl.org/NET/erdf/profile will first visit this profile document and apply the transformation declared here. The results of that transformation will contain a statement identifying the transformation that should be applied to convert the originating document into RDF/XML. The GRDDL client has everything it needs to get RDF/XML from the original XHTML document, while the author of the originating document need not concern themselves with the details of the profile, merely including the reference to its URI is enough.

This following link provides the statement : extract-rdf.xsl, profile