《issues–cp问题–cp》doc版

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1、Issues–ContentPackagingThefollowinglistdescribesvariousimportantissuesassociatedwithimplementationofthecontentpackagingspecification,whichisnotmeanttobeexhaustive.Thereissomeoverlapincertainofthepointsmadewhichinvolvediscussionofparticularsbearingongeneralpointsmadeelsewhere.1.Conformanceand

2、conformancestatementsThereareanumberofdifferentaspectstodiscusshere.Thereareconformancestatementsrelatingtocontentpackagesthemselvesandtothesystemsandtoolsusingthem.Thoserelatingtotheformerarerelativelystraight-forward,butforsystemsandtoolsconformance,therearesimilarproblemsandchallengesasth

3、oseassociatedwiththemetadataspecification(applicationconformance).Thereisthedeliberateandrepeateduseofverb“process”inconformancestatements.“AconformingsystemortoolmustrecognizeandprocessanyconformingIMSContentPackage..”whichbegsthequestionastowhat“process”mightmean,butthisisfollowedinthenext

4、sentenceby“ThefeaturesandfunctionalityofsystemsandtoolsthatprocessIMSContentPackagesarepurposelynotspecified.”Thismaynotbeexactlywhatoneexpectstoreadinaspecification(!),andonewouldsupposethatitisuptothesystemdevelopertomakereasonableassumptionsaboutwhat“process”mightmeaninlinewiththeBestPrac

5、ticeandImplementationGuideandotheradviceinthespecificationdocumentset.Withoutgettingtooinvolvedindescribingvariousscenariosastowhatitmightmean,severalexamplesimmediatelycometomindwhichareclearlyopentointerpretationandarediscussedfurtherbelow.Moreover,systemsandtoolsconformanceisintroducedasf

6、ollows..“Forthepurposesofconformance,systemandtoolconformancereferstothesystemsandtoolsthatimport,export,create,andmanipulateIMSContentPackages.”Thisagainisnotwhatmightbeexpected(!).Systemsandtoolswhichmighthavequitedisparatefunctionalityinprocessingpackagesaretreatedthesamethoughtherearecle

7、arlydifferentissuesassociatedwithexport,importandmanipulationofpackages.Forexample,COSE(v.2.05)packages[exports]contentaccordingtothespecificationbutdoesn’tusemetadataotherthanattoplevelanddoesn’tusesub-manifests.Sincetheseelementsareoptional,COSEc