Query Division and Reformulation in Ontology-Based Heterogeneous Information Integration

People could obtain information from heterogeneous data resources by semantic querying based on ontologies. In ontology-based heterogeneous information integration, dividing and reformulating a global query for ontology concepts´ instances into multiple sub-queries over those local information sources is a fundamental challenge. This paper presents a kind of uniform expression for concept instances´ queries and a method to divide the global query into local ones. All local query results could be integrated as answers of the global query according to the integration expression got by query division