Schema Evolution publication categorizer

... 666.47 KB Many problems in information integration rely on specifications, called schema mappings, that ... for both relational and nested data are well-known. In this work, we present a new formalism for schema mapping that extends these existing formalisms in two significant ways. First, our nested mappings allow for nesting and ...

Publication - huliganka - 04/17/2013 - 00:05 - 0 comments - 1 attachment

... be a Σ1-query. An (equivalent) reformulation of q1 in the presence of C is a Σ2-query, q2, such that q2 gives the same ... ∪ Σ2-database instance that satisfies C. In general, there may exist multiple such reformulations and choosing among ...

Publication - huliganka - 04/16/2013 - 23:38 - 0 comments - 1 attachment