Grddl is a w3c recommendation for extracting rdf data from arbitrary xml and xhtml via a transformation, typically written in xslt. see for more details.

this module implements grddl in perl. it offers both a low level interface, allowing you to generate a list of transformations associated with the document being processed, and thus the ability to selectively run the transformation; and a high-level interface where a single rdf model is returned representing the union of the rdf graphs generated by applying all available transformations.