Abstract. Query rewriting method is proposed for the heterogeneous information integration infrastructure formed by the subject mediator environment. Local as View (LAV) approach treating schemas exported by sources as materialized views over virtual classes of the mediator is considered as the basis for the subject mediation infrastructure. In spite of significant progress of query rewriting with views, it remains unclear how to rewrite queries in the typed, objectoriented mediator environment. This paper embeds conjunctive views and queries into an advanced canonical object model of the mediator. The "selectionprojection-join" (SPJ) conjunctive query semantics based on type specification calculus is introduced. The paper demonstrates how the existing query rewriting approaches can be extended to be applicable in such typed environment. The paper shows that refinement of the mediator class instance types by the source class instance types is the basic relationship required for establishing query containment in the object environment.
Abstract:This position paper provides a short summary of results obtained so far on an application-driven approach for mediation-based EIS development. This approach has significant advantages over the conventional, information source driven approach. Basic methods for the application-driven approach are discussed including synthesis methods of canonical information models, unifying languages of various kinds of heterogeneous information sources in one extensible model, methods of identification of sources relevant to an application and their registration at the mediator applying GLAV techniques as well as ontological contexts reconciliation methods. Methodology of EIS application development according to the approach is briefly discussed emphasizing importance of a mediator consolidation phase by the respective community, application problem formulations in canonical model and their rewriting into the requests to the registered information sources. The technique presented is planned to be used in various EIS and information systems.
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