| http://www.w3.org/ns/prov#value | - To see this, consider a trivial query view E=R and an update view R=E???(Q1???Q2) where E is an entity set, R is a relational table, and Q1 and Q2 are queries on the entity schema that do not mention E. Unfolding the update view yields the roundtripping condition E=E???(Q1???Q2).
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