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1、齐鲁工业大学外文资料及中文译文院系名称信息学院学生姓名李冉学生学号201003031006专业班级计科（软件）10-1指导教师刘嵩二○一四年四月六日外文资料Asurveyonwebservicescomposition_Dustdar_Schreiner_inPressAnorchestrationmodeldefinesabstractionsandlanguagestodefinetheorderinwhichandtheconditionsunderwhichwebservicesareinvoked.Orchestrationmodelsuseprocess-mode
2、llinglanguages,suchasUMLactivitydiagrams,Petri-nets,state-charts,4S.DustdarandW.Schreinerrule-basedorchestration,activityhierarchies,andπ-calculus.Dataanddataaccessmodelsdefinehowdataisspecifiedandexchangedbetweencomponents.Theserviceselectionmodeldealswithstaticanddynamicbindingthatishowawe
3、bserviceisselectedasacomponent,staticallyatdesign-timeordynamicallyduringrun-time.Transactionsdefinewhichtransactionalsemanticscanbeassociatedtothecompositionandhowthisisdone.Finally,wemustalsoconsideramodelforexceptionhandlingtohandleexceptionalstatesduringtheexecutionofthecompositeservicew
4、ithouttheservicebeingaborted.TheBusinessProcessExecutionLanguageforWebServices(BPEL4WS)standardproposedbyIBM(Virdell,2003),MicrosoftandBEA(Andrewsetal.,2003)isinmanycasesrelatedtoformerstandards,suchasWSFLorXLANG.BPELdescriptionsareXMLdocuments,whichdescribetherolesinvolvedinthemessageexchan
5、ge,supportedporttypesandorchestration,andcorrelationinformationasaspectsofaprocess.BPEL4WSisaservicecompositionmodel(Wohedetal.,2003),whichsupportsboth,compositionandcoordinationprotocols.Italsoconsistsofanactivity-basedcomponentmodel,anorchestrationmodelthatallowsthedefinitionofstructuredac
6、tivities,XMLschemadatatypes,aserviceselectionmodelandamechanismforexception,eventandcompensationhandling.3Managingafilmcrew:acasestudyAccordingtoDustdarandTreiber(2004)thecasestudyofmanagingafilmcrewhasbeenselected,inordertoexplainthedifferentconceptsandframeworksintroducedinvariouspapers,wi
7、thaconsistentreferencescenariothatrunsthroughthewholepaper.Basically,afilmcrewconsistsofoneormorefilmdirectors,externalexpertsandcrew-members.Eachoftheseteamsprovidesparticularservicesandworktogetherinalooselycoupledway,providingtheirexpertiseondem
