外文翻译--uml 2.0 序列图组合碎

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1、中文2270字UML2.0SequenceDiagramCombinedfragmentsThediagram'spurposeThesequencediagramisusedprimarilytoshowtheinteractionsbetweenobjectsinthesequentialorderthatthoseinteractionsoccur.Muchliketheclassdiagram,developerstypicallythinksequencediagramsweremeantexclusivelyforthem.However,anorganization'sbusi

2、nessstaffcanfindsequencediagramsusefultocommunicatehowthebusinesscurrentlyworksbyshowinghowvariousbusinessobjectsinteract.Besidesdocumentinganorganization'scurrentaffairs,abusiness-levelsequencediagramcanbeusedasarequirementsdocumenttocommunicaterequirementsforafuturesystemimplementation.Duringther

3、equirementsphaseofaproject,analystscantakeusecasestothenextlevelbyprovidingamoreformallevelofrefinement.Whenthatoccurs,usecasesareoftenrefinedintooneormoresequencediagrams.Anorganization'stechnicalstaffcanfindsequencediagramsusefulindocumentinghowafuturesystemshouldbehave.Duringthedesignphase,archi

4、tectsanddeveloperscanusethediagramtoforceoutthesystem'sobjectinteractions,thusfleshingoutoverallsystemdesign.Oneoftheprimaryusesofsequencediagramsisinthetransitionfromrequirementsexpressedasusecasestothenextandmoreformallevelofrefinement.Usecasesareoftenrefinedintooneormoresequencediagrams.Inadditi

5、ontotheiruseindesigningnewsystems,sequencediagramscanbeusedtodocumenthowobjectsinanexisting(callit"legacy")systemcurrentlyinteract.Thisdocumentationisveryusefulwhentransitioningasystemtoanotherpersonororganization.ThenotationSincethisisthefirstarticleinmyUMLdiagramseriesthatisbasedonUML2,weneedtofi

6、rstdiscussanadditiontothenotationinUML2diagrams,namelyanotationelementcalledaframe.TheframeelementisusedasabasisformanyotherdiagramelementsinUML2,butthefirstplacemostpeoplewillencounteraframeelementisasthegraphicalboundaryofadiagram.Aframeelementprovidesaconsistentplaceforadiagram'slabel,whileprovi

7、dingagraphicalboundaryforthediagram.TheframeelementisoptionalinUMLdiagrams;asyoucanseeinFigures1and2,thediagram'slabelisplacedinthetopleftcornerinwhatI'llcalltheframe's"namebox,"asortofdog-earedrectangle,an