Ontology based semantic information integration can solve the schematic heterogeneity among distributed data sources, but can not solve context heterogeneity which is widely existed. To solve context heterogeneity, firstly a context presentation to describe the implicit semantics formally is introduced. Then ,aiming at the represent heterogeneity, one of the context heterogeneities ,a flexible, simple and scalable context conversion method based on equivalence class is proposed. It avoids the shortcoming of existing method which need...
