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1、JournaiofSoutheastUniversity（EngiishEdition）Dec.2001Voi.17No.2ISSN1003—7985XMLBasedDataCubeandX-OLAP!WangXiaoiingDongYisheng（DepartmentofComputerScienceandEngineering，SoutheastUniversity，Nanjing210096，China）Abstract：Datawarehouseprovidesstorageandmana
2、gementformassdata，butdataschemaevoiveswithtimeon.Whendataschemaischanged，addedordeieted，thedataindatawarehousemustcompiywiththechangeddataschema，sodatawarehousemustbere-organizedorre-constructed，butthisprocessisexhaustingandwastefui.Inordertocopewitht
3、heseprobiems，thispaperdeveiopsanapproachtomodeidatacubewithXML，whichemergesasauniversaiformatfordataexchangeontheWebandwhichcanmakedatawarehousefiexibieandscaiabie.ThispaperaisoextendsOLAPaigebraforXMLbaseddatacube，whichiscaiiedX-OLAP.Keywords：datawar
4、ehouse，datacube，XML，X-OLAP，semi-structureddata［1］Datawarehousingtechnoiogiesareemergingassemi-structureddataindatawarehouse.keytechnoiogiestoimprovedataanaiysis，decisionTherestsectionsofthispaperareorganizedassupportactivitiesandautomaticextractionofk
5、nowiedgefoiiows.Section1introducesreiatedworkbyothersinfromdata.Muchprogressinthesenewfieidshasbeenthisfieid；Section2givesthesystemarchitecture；［2］witnessed.However，mostdatafromappiicationSection3presentsmappingmethodandX-OLAPsystemsorwebisirreguiaran
6、dincompiete，caiiedoperationsonXML-baseddatacubeindatawarehouse.［3］semi-structuredata.Thetermsemi-structureddataConciusionsarepresentedintheiastsection.hasbeenusedtorefertodatawhichisirreguiaror1RelatedWorkwhichexhibitstypeandstructuraiheterogeneitysem
7、i-structured，sinceitmaynotconformtoarigid，Inrecentyears，someresearchershavedonemuchpredefinedschema.Becausethereisnouniformresearchinthesefieids，whichinciudeshowtomodeischemaforthosesemi-structureddata，howtocieanandguerysemi-structureddataandhowtoextr
8、actandandintegrateheterogeneousdataandhowtoorganizeintegrateinformationfromtheheterogeneousdata［4］semi-structureddataarechaiienging.Intraditionaisourcesintodatawarehouse.Manyprototypesanddatabasesystems，itisexhaustingtomodifythecommerciaisyste
