基于Native XML数据库的知识库系统应用研究的中期报告

基于NativeXML数据库的知识库系统应用研究的中期报告AbstractWiththerapiddevelopmentofinformationtechnology,knowledgemanagementhasbecomeanimportantwayforenterprisestoobtaincompetitiveadvantages.NativeXMLdatabases,asakindofdatabasetechnology,haveadvantagesinhandlingsemi-structureddata,whichcanbeappliedtoknowledgemanagementsystems.Thispaperpresentsthemid-termreportoftheresearchontheapplicationofknowledgemanagementsystembasedonnativeXMLdatabase,whichincludesthecurrentstatusofresearch,thedesignofthesystemarchitecture,theimplementationofthesystemmodules,andtheevaluationofsystemperformance.Thepurposeofthisresearchistoprovideafeasiblesolutionfortheknowledgemanagementoftheenterprise.Keywords:NativeXMLdatabase;Knowledgemanagementsystem;Semi-structureddata1.IntroductionAsweknow,knowledgeisthemostimportantassetofanenterprise.Howtoeffectivelymanageanduseknowledgehasbecomeanimportantchallengefortheenterprise.Knowledgemanagement(KM)isthepracticeofcapturing,organizing,andmakingavailableacompany'scollectiveexpertisetoimprovebusinessperformance.Inrecentyears,informationtechnologyhashadagreatimpactonthedevelopmentofKM,whichsupportedbyvariousknowledgemanagementsystems(KMSs).NativeXMLdatabaseisakindofdatabasetechnology,whichhasmanyadvantagesinhandlingsemi-structureddata.Comparedwithtraditionalrelationaldatabases,nativeXMLdatabasehasamoreflexibleschemaandsupportsthestorageandqueryingofXMLdocumentsdirectly.Therefore,itissuitableformanagingalargenumberofsemi-structureddatainKMSs.2.CurrentStatusofResearchAtpresent,therearesomeresearchesontheapplicationofnativeXMLdatabasesinknowledgemanagement.Forexample,LinandLi(2012)proposedahybridmodelofKMSwhichcombinesthestrengthsoftraditionalKMSandnativeXMLdatabases.Schicktanzetal.(2004)proposedaknowledgemanagementsystemthatusesanativeXMLdatabasetostoreandretrievesemi-structuredknowledgedocuments.Zhangetal.(2012)proposedasystemarchitectureforKMSbasedonnativeXMLdatabaseandOntology.However,therearestillsomeproblemsneedtobesolved,suchasthedesignofthesystemarchitecture,theimplementationofthesystemmodules,andtheevaluationofsystemperformance.3.SystemArchitectureThedesignofthesystemarchitectureisthefirststepindevelopingaKMSbasedonnativeXMLdatabase.ThearchitectureoftheKMSconsistsofthreelayers:thepresentationlayer,thelogiclayer,andthedatalayer.Thepresentationlayerprovidesdifferentinterfacesforuserstoaccessthesystem,includingtheweb-basedinterface,thedesktopinterface,andthemobileinterface.Thelogiclayerisresponsibleforprovidingbusinesslogicservices,whichincludeknowledgecreation,knowledgestorage,knowledgeretrieval,andknowledgesharing.Thedatalayerisresponsibleforstoringandmanagingknowledgedata,whichincludesXMLdocuments,Ontologies,andotherstructuredandsemi-structureddata.4.SystemModulesBasedonthesystemarchitecture,theKMSisdividedintodifferentmodules,includingtheknowledgecreationmodule,theknowledgestoragemodule,theknowledgeretrievalmodule,andtheknowledgesharingmodule.Theknowledgecreationmoduleprovidesafriendlyinterfaceforuserstocreateandeditknowledgedocuments.Userscancreatenewdocumentsormodifyexistingdocuments,andaddmetadatasuchaskeywords,categories,andauthors.Theknowledgestoragemoduleisresponsibleforstoringandmanagingknowledgedata.ItincludestheXMLdatabaseandOntologydatabaseforstoringandmanagingstructuredandsemi-structureddata.Theknowledgeretrievalmoduleprovidesaninterfaceforuserstosearchandretrieveknowledgedocuments.Userscansearchfordocumentsbasedonkeywords,categories,authors,andothermetadata.Theknowledgesharingmoduleprovidesaplatformforuserstoshareknowledgewitheachother.Userscanrate,comment,andshareknowledgedocumentswithothers.5.EvaluationofSystemPerformanceTheevaluationofsystemperformanceisanimportantstepindevelopingaKMSbasedonnativeXMLdatabase.TheperformanceoftheKMSisevaluatedbasedonseveralcriteria,suchasresponsetime,throughput,andscalability.TheresponsetimeoftheKMSisthetimerequiredforthesystemtorespondtoauser'srequest.ThethroughputoftheKMSisthenumberofrequeststhatthesystemcanhandleperunittime.Scalabilityistheabilityofthesystemtohandleincreasingworkloads.6.ConclusionThispaperpresentsamid-termreportoftheresearchontheapplicationofknowledgemanagementsystembasedonnativeXMLdatabase.Thepaperintroducesthecurrentstatusofresearch,thedesignofthesystem