Importance

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Abstract

The present system imports data from a source schema into a target schema while keeping the semantics, structure, and constraints of the data intact. The system is driven by user inputs that define a set of correspondences between the source schema and the target schema. The system meets the requirement that data produced at the target not violate the schema of the target; rather, the data must conform to the target schema. The system can be applied in both target materialization and query unfolding, producing all the meaningful queries required in data translation by finding all the associations that exist in the schemas. Each query maps from a source association to a target association. The user selects a subset of those queries that match the desired data translation. Target constraints are taken into account by the present system to infer the user intention and to guarantee that the generated data satisfies the structure and constraints of the target schema. Fields required by the target schema that are not provided by the source schema are automatically populated by the present system. The target instance is guaranteed to be in partition normal form.

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First Claim