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1、AutomaticallyOntologyConstructedFromOnlineOntology2008－12－25数据库的语义检索需要多领域本体的支持。如何重用这些本体？WEB上越来越多的InterLinkingRDFdata,粗略估计，RDF三元组的数量为：2billionInterlinkedbyaround3millionRDFlinks。当前基于keyword的语义搜索引擎（swoogle,SWSE,Falcons等）仅返回一个本体列表，并没有进一步的提供本体重用支持。Web上越来越多的本体为用户提供API，如YAGO，DBPedia,Gename,D
2、BLP等BackgroundandMotivation本体开发的方式Fromscratch－很困难，需要领域专家的参与Ontologyreuse－一种好的选择本体的构建步骤确定应用领域术语明确术语间的联系、属性及约束本体的“模块化”（Modularization）技术允许用户协同开发，导入本体模块（module）,但并没有提供抽取（extraction）或合并(merge)用户感兴趣的本体部分的支持.如何自动构建面向特定应用的领域本体？BackgroundandMotivationArchitectureOntoExtractorOntoRankerExtracto
3、rMap&MergeOnto1Onto2Onton……OWLOntoKBSearchURIsTermsReasonerSPARQLProcessorOWLOntologyTranslatorTranslatingMethodsManytomany-AtableTonlyusedtorelatetwoothertableT1,T2(manytomany)T1->c1,T2->c2,op1.domain=c1,op1.range=c2,op2->domain=c2,op2->range==c1.Referentialintegrityconstraints(i.e.if
4、TisrelatedtoT1byaforeignkeywhichisprimarykeyatthesametime,thenTismappedtoasubclassoftheclasscorrespondingtoT1.)T,T1->C,C1,CsubClassOfC1TranslationfromRDBtoRDF(S)/OWLReferentialconstraints(i.e.ifatableThasareferentialconstraintwithT1,andifc,c1aretheclassescorrespondingtoT,T1respectively
5、,thenweassigntocanobjectpropertyopwhoserangeisc1,andweassigntoc1anobjectpropertyop'whoserangeisc.TopreservetheoriginaldirectionofthereferentialconstraintfromTtoT1,wesettheobjectpropertyopasfunctional)t,t1->c,c1,op.domain=c,op.range=c1,op’.domain=c1,op’.range=c,op.hasFunctionalProperty.
6、Inothercase,tablenamecanbetranslatedintoclass;columnnamesthatarenotforeignkeycanbetranslatedintoDatatypeProperty.TranslationfromRDBtoRDF(S)/OWLDrawbacksWithoutconsideringmoreconstraintinformationandrecordsinformation,examplecolumnsvalueconstraint.Translatingallcolumnnamesthatarenotfore
7、ignkeyintodatatypepropertymaybenotappropriateforsomespecificapplication.TranslationfromRDBtoRDF(S)/OWLSwoogleOntoRankDifferentiallytreatthefollowing4relations.Eachofrelationswereassigneddifferentlyweight.Imports(A,B)User-terms(A,B)Extends(A,B)Asserts(A,B)OntologiesrankingOntokhojCons
