| http://www.w3.org/ns/prov#value | - A proposed optimisation strategy, for example, is the following: Where R is a given restriction (i.e., some WHERE clause) and T represents either a union, intersect, or minus operation, and p and q are relations, and C is a function representing cost of execution, given a query of the form R(T(p, q)), if C(T(R(p), R(q))) < C(R(T(p, q))) then replace R(T(p, q)) with T(R(p), R(q)).
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