数据仓库中元数据的表示模型.pdf

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1、JournalofBeijingInstituteofTechnology，2002，VoI.11，No.1UniformRepresentationModelforMetadataofDataWarehouseWANGJian-fen，CAOYuan-da（DepartmentofComputerScienceandEngineering，BeijingInstituteofTechnoIogy，Beijing100081，China）Abstract：Auniformmetadatarepresent

2、ationisintroducedforheterogeneousdatabases，muIti-mediainformationandoth-erinformationsources.SomefeaturesaboutmetadataareanaIyzed.TheIimitationofexistingmetadatamodeIiscomparedwiththenewone.ThemetadatamodeIisdescribedinXMLwhichisfitformetadatadenotationan

3、dexchange.TheweII-structureddata，semi-structureddataandthoseexteriorfiIedatawithoutstructurearedescribedinthemetadatamodeI.ThemodeIprovidesfeasibiIityandextensibiIityforconstructinguniformmetadatamodeIofdatawarehouse.Keywords：datawarehouse；metadata；datamo

4、deI；XMLCLCnumber：TP311.138Documentcode：AArticleID：1004-057（92002）01-0085-04InthecourseofconstructingandmakinguseofdatadifficuIttobeimpIemented.Ref［.3］adoptsthegraphwarehouse，thecompIexityofcoIIecting，constructingandstructuretodescribethemodeIs，soitismorec

5、ompIexmanagingaIargeamountofdataisbecomingabigprob-andonIyexpressesonesubsetofmetadata.Ref［.4］dis-Iem.OneofthekeytechniguesofdecisionsupportwhichcussesastandardforfiIe-IeveImetadata.ToovercomethecanbeachievedbyaccessingandgueryingvariousdataIimitationofth

6、eseexistingmethods，wepresentauniformandanaIyzingdocumentsonthebasisoffusingdispersivemetadatarepresentationmodeI，whichisdescribedinandheterogenousrawdata，ishowtoimpIementtheex-XML（extensibIemarkupIanguage）.changeandsyncronizationofthemetadata.ModerndataXM

7、Lprovidesafire-newtooIforInternetdeveIoperswarehouseenvironmentsintegrateaIargenumberoftocarryouteIectronic-businessandeIectronicdatainter-databases，fiIesystems，tooIsandappIicationswhicharechange（EDI）.XMLisn’tanindependentandpredefinedtypicaIIybasedondiff

8、erentdatamodeIsandstructuraIde-markupIanguage，butisameaIanguagetodescribeotherscriptionformats，andtheinterdependenciesamongtheseIanguages.XMLcandesignitsownmarks.XMLencap-varioussub-systemsmakedatawarehousesmorecomp