XML schema unification in heterogeneous information sources integration

摘要

The unification of retrieval results from individual information source is expected at Internet, by the unified structural retrieval execution from many and unspecified heterogeneous sources, with XML common data model. This unification transformation is implemented by the subtrees extraction from individual source and the schema transformation of each subtrees. This paper investigates the transformation for unification of retrieve results in our mediation system: MediPresto/XM for many and unspecified heterogeneous sources with XML common data model. This transformation consists of basic schema transformation and elements grouping, and the schema transformation definition is declarative and does not include references to any source schemas.