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