外文翻译--uml 2.0 序列图组合碎片

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

2、sinessstaffcanfindsequencediagramsusefultocommunicatehowthebusinesscurrentlyworksbyshowinghowvariousbusinessobjectsinteract.Besidesdocumentinganorganization'scurrentaffairs,abusiness-levelsequencediagramcanbeusedasarequirementsdocumenttocommunicaterequirementsforafuturesystemimplementation.During

3、therequirementsphaseofaproject,analystscantakeusecasestothenextlevelbyprovidingamoreformallevelofrefinement.Whenthatoccurs,usecasesareoftenrefinedintooneormoresequencediagrams.Anorganization'stechnicalstaffcanfindsequencediagramsusefulindocumentinghowafuturesystemshouldbehave.Duringthedesignphase

4、,architectsanddeveloperscanusethediagramtoforceoutthesystem'sobjectinteractions,thusfleshingoutoverallsystemdesign.Oneoftheprimaryusesofsequencediagramsisinthetransitionfromrequirementsexpressedasusecasestothenextandmoreformallevelofrefinement.Usecasesareoftenrefinedintooneormoresequencediagrams.

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

6、weneedtofirstdiscussanadditiontothenotationinUML2diagrams,namelyanotationelementcalledaframe.TheframeelementisusedasabasisformanyotherdiagramelementsinUML2,butthefirstplacemostpeoplewillencounteraframeelementisasthegraphicalboundaryofadiagram.Aframeelementprovidesaconsistentplaceforadiagram'slabe

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