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Ontology-based data integration has been one of the practical methodologiesfor heterogeneous legacy database integrated service construction. However, itis neither efficient nor economical to build the cross-domain ontology on topof the schemas of each legacy database for the specific integration applicationthan to reuse the existed ontologies. Then the question lies in whether theexisted ontology is compatible with the cross-domain queries and with all thelegacy systems. It is highly needed an effective criteria to evaluate thecompatibility as it limits the upbound quality of the integrated services. Thispaper studies the semantic similarity of schemas from the aspect of properties.It provides a set of in-depth criteria, namely coverage and flexibility toevaluate the compatibility among the queries, the schemas and the existingontology. The weights of classes are extended to make precise compatibilitycomputation. The use of such criteria in the practical project verifies theapplicability of our method.

Is your Schema Good Enough to Answer my Query?