| http://www.w3.org/ns/prov#value | - T} and one or more write-nodes {Wj } each representing a write operation on at least one of said tables {T}, wherein k is a positive integer and wherein said evaluating step (a) comprises the steps of: (a.1) identifying in said query graph G all of said write-nodes {Wj } and all of said read-nodes {Rk } that represent a read or write operation for which said each table Teach is an object. 7.
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