| http://www.w3.org/ns/prov#value | - processing and accessing data objects, particularly documents, and system thereforUS6233584Sep 9, 1997May 15, 2001International Business Machines CorporationTechnique for providing a universal query for multiple different databasesUS6236768May 1, 1998May 22, 2001Massachusetts Institute Of TechnologyMethod and apparatus for automated, context-dependent retrieval of informationUS6236987Apr 3, 1998M
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