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We study the problem of answering queries through a target schema, given a set of mappings between one or more source schemas and this target schema, and given that the data is at the sources. The schemas can be any combination of relational or XML schemas, and can be independently designed. In addition to the source-to-target mappings, we consider as part of the mapping scenario a set of target constraints specifying additional properties on the target schema. This becomes particularlydoi:10.1145/1007568.1007611 dblp:conf/sigmod/YuP04 fatcat:zggnrx6pozdrzcibji4rsieefa