| http://www.w3.org/ns/prov#value | - Popular content types such as pictures, movies, calendars, encyclopedic articles, news recipes etc. are already sufficiently well supported on the Web.However, there is a long tail of special-interest content (profiles of expertise, historic data and events, bio-medical knowledge, intra-corporational knowledge etc.) which has very low or no current support (for filtering, aggregation, searching, q
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