？？BERGAMASCHI S, CASTANO S, VINCINI M. Semantic integration of semistructured and structured data sources[J]. SIGMOD Record, 1999, 28(1):54-59.
[2]
？？ASLAN G, MCLEOD D. Semantic heterogeneity resolution in federated databases by metadata implantation and stepwise evolution[J].VLDB Journal, 1999,8(2):120-132.
[3]
？？HAKIMPOUR F, GEPPERT A. Resolving semantic heterogeneity in schema integration: an ontology based approach[A]. Proceedings of the International Conference on Formal Ontology in Information Systems(FOIS 2001)[C].New York,NY,USA:ACM Press,2001.297-308.
[4]
？？OKBC. Open knowledge base connectivity[EB/OL]. http://www.ai.sri.com/okbc/,1998-04-09.
[5]
？？NOY N F,FERGERSON R W,MUSEN M A.The knowledge model of Protege2000: combining interoperability and flexibility[A].Proceedings of EKAW 2000[C].Reviera,France:Springer, 2000.17-32.
[6]
？？VDOVJAK R, HOUBEN G. RDF-based architecture for semantic integration of heterogeneous information sources[A].International Workshop on Information Integration on the Web, Proceedings of the WIIW’2001[C].Riode Janeiro, Brazil:ACM Press,2001. 51-57.
？？BERGAMASCHI S, CASTANO S, VINCINI M, et al. Semantic integration of heterogeneous information sources[J].Source Data & Knowledge Engineering, 2001,36(3):215-249.
