| http://www.w3.org/ns/prov#value | - Two relations are joined on fields F1 and F2 by first taking their Cartesian product (the Cartesian product of two relations A and B is the set of all tuples a1, . . . , am, b1, . . . , bn, where a1, . . . , am is a tuple from A, and b1, . . . , bn is a tuple from B) and then selecting all tuples such that F1=F2.
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