Stylesheet to extract FOAF info from XHTML documents

This transformation produces FOAF data from XHTML, per RDF in XHTML proposal. (see also: demo.), with the following conventions:

• each data for a Person is contained in an element with a class set to foaf-person
• the name of the person is the content of the element with a class set to foaf-name, possibly detailed with sub-elements with class set to foaf-family and foaf-given
• an image element with a class set to foaf-depiction refers to a picture of the person
• any mailto: link in this element is associated with as a mailbox of the person
• any tel: link in this element is associated with as a phone number for the person
• the homepage of the work place is identified with a link qualified with a rel attribute set to foaf-work
• the homepage of the person is identified with a link qualified with a rel attribute set to foaf-home
• known people are identified with links to their homepage or their mailbox, with a rel set to foaf-knows

This is purely experimental, and has not been reviewed (and even less endorsed) by anybody involved in the FOAF project.

If you want to extend this style sheet to support additional properties embedded in the mark up structure as described above, this style sheet has an extensibility point in so that it calls a foafGrddl:extend template in each foaf:Person it creates; by importing this style sheet and overriding the foafGrddl:extend template, you can scrape new properties. (foafGrddl is linked to http://www.w3.org/2003/12/rdf-in-xhtml-xslts/grokFOAF)