PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Quite a few of you suggested that we have the solution - XHTML with DTDs, or XML. The problem is that these have been around for coming on a decade, and are little if at all adopted by mainstream web developers (in fact, one of the reasons I focussed so specifically on backwards compatibility in HTML5 is that the lack of compatibility for most of the last 10 years with most browsers in common use
http://www.w3.org/ns/prov#wasQuotedFrom
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