| http://www.w3.org/ns/prov#value | - Thus the identity of a data item is independent of its name, origin, location, address, or other information not derivable directly from the data, and depends only on the data itself. [0021] This invention further provides an apparatus and a method for determining whether a particular data item is present in the system or at a location in the system, by examining only the data identities of a plur
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