文档介绍：sourceschema3sourceschema1Findhouseswith4bedrooms pricedunder300KwrapperwrapperwrapperProvideauniformqueryinterface3ArchitectureofDataIntegrationSystemscost|city|numbeds|wrapperpricelocationbeds$185KUrbana,IL2$299KKent,wrapperpricelocationbedsbaths$185,000Urbana,IL22$270,000Seattle,WA3-$185,000<em>Urbana,IL</em>2beds/2bathsCentury21$270,000<em>Seattle,WA</em>3bedsREMAXrealestateFindhouseswith4bedrooms pricedunder300KInvolvemanytasks4Uniformquerycapabilityacrossautonomous,heterogeneousdatasourcesonLAN,WAN,anizationhasonaverage49databasescantalkaboutthesametopic,butusedifferentvocabularies,essingasingledb?,barnes&,?HundredsofCSwebsitesinUS,intextformatcanweconsolidateinformationaboutallofthemandquerythemasifqueryingagiantrelationaldatabase?essasetofheterogeneous,distributed,essingasingledatabase?ArisesinnumerouscontextsontheWeb,atenterprises,military,ooperation,bio-informaticsdomains,merce,-hocprogramming:createaspecialsolutionforeverycase;-munityAI/apers,...CompaniesInformatica,manyothers,...8ABriefResearchHistoryManyearlyad--structureddata,XMLWrappers,infoextractionOtherissues:queryoptimization,schemamatching,...CurrentdirectionsDIforspecializeddomains(.,bioinformatics)on-the-flyDI,entity-centricDIsimplifyintegrationtasksNewtypesofdatasharingsystemsP2Psystems,SemanticWeb9Datawarehousingvs. VirtualDIsystems10