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【英文标准名称】:Informationtechnology-InternationalstandardizedprofilesFVT3nn-Virtualterminalbasicclass-Registerofattributeassignmenttypedefinitions-FVT322-FontAssignmentTypeNo.2
【原文标准名称】:信息技术.国际标准数据区FVT3nn.虚拟终端基本级别.属性赋值类型定义寄存器.FVT322.2号字形赋值类型
【标准号】:BSISO/IECISP11186-4-1998
【标准状态】:现行
【国别】:英国
【发布日期】:1998-04-15
【实施或试行日期】:1998-04-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:句法;数据处理;网络互连;信息交流;合格;开放系统互连;数据布置;计算机间通信;字符集;寄存器(计算机);应用层(开放系统互连);计算机终端;通信规程;字符串
【英文主题词】:Assignmentcodes;Charactersets;Dataprocessing;Definitions;Informationinterchange;Informationtechnology;Internationalregister;Networkinterconnection;OSI;Standardizedprofiles
【摘要】:TheconceptofProfilesforOS,andthestructureoftheInternationalStandardizedProfilesthatdocumentthem,aredefinedinISO/IECTR10000-l.SuchProfilesaredividedintoanumberofdifferentclassesandsub-classes.Twooftheseclassescontainsub-classescomprisingfunctionsoftheVirtualTerminalBasicClassServiceandProtocolspecifiedinthebasestandardsIS09040andIS09041.ThesearetheApplicationProfiles(A-Profiles)andtheInterchangeFormatandRepresentationProfiles(F-Profiles).TherelationshipbetweenA-ProfilesandF-Profilesisdescribedin7.3.2ofISO/IECTR10000-landisasfollows.ApplicationLayerbasestandardsrequire,implicitlyorexplicitly,thestructureofinformationcarriedorreferencedbythemtobespecifiedforeachinstanceofcommunication.ItisthepurposeofF-Profilestospecifysuchinformationstructures.ParticularfunctionalrequirementsmaythenbemetbythecombinationofanA-ProfilewithoneormoreFProfiles.ThispartofISO/IECISP11186providesthespecificationofafontassignmenttypethatmaybeusedtospecifyafontassignmentvalueinwhichdifferentfontpropertyvaluesmaybeassignedtodifferentcharacterswithinasingleVTcharacter-repertoire.ThisfontassignmenttypeisintendedforuseinconjunctionwitharepertoireassignmenttypethatpermitsthecharactersofmorethanonescripttobepresentinasingleVTcharacter-repertoire.ItisparticularlysuitedforuseinconjunctionwiththerepertoireassignmenttypeforISOilEC10646whosespecificationisgiveninlSO/lECISP11186-2.Itisintendedthatfontpropertyvaluesshouldbeassignedonascript-by-scriptbasis,forexamplesothatscriptswithaleft-to-rightwritingmodeandwitharight-to-leftwritingmodemaycoexistwithinasingleVTcharacterrepertoire.1.2PositionwithinthetaxonomyThetaxonomyofInternationalStandardizedProfilesforOSIislaiddowninISO/IECTR10000-2.Withintheclassificationschemeofthistaxonomy,theOSIProfilesspecifiedinthisInternationalStandardizedProfileareintheVirtualTerminalRegisteredObjectsub-classoftheclassofInterchangeFormatandRepresentationProfiles.AProfilewithinthissubclasshasaProfileidentifieroftheformFVTabc,whereabcisastructurednumericalidentifierthatidentifiesthepositionoftheProfilewithineachofthethreelevelsofsubdivisionofthesubclass.Thevaluesofaandbaresingledigitsbutcisanintegerthatisnotnecessarilyasingledigit.1.3ScenarioThespecificationoftheVirtualTerminalServiceisgiveninIS09040.ItisbasedonamodelinwhichtwoVT-userscommunicatebymeansofasharedConceptualCommunicationArea(CCA)thatisaconceptualpartoftheVTservice-provider.InformationexchangeismodelledbyoneVT-userupdatingthecontentoftheCCAandthechangedstateoftheCCAthenbeingmadeaccessibletothepeerVT-user.TheCCAisstructuredbytheVirtualTerminalServiceintoanumberofcomponents.Ofthesecomponents,theConceptualDataStore(CDS)containsoneortwodisplayobjects(DOS),eachofwhichincludesaone,twoorthreedimensionalarrayofarrayelements.Eacharrayelementiseitheremptyorhasacontentthatconsistsofaprimaryattributeandanumberofsecondaryattributes,Theprimaryattributevalueselectsonecharacter-boxgraphicelementfromarepertoireofsuchelementsthatisdeterminedbythecharacter-repertoiresecondaryattribute.Theothersecondaryattributesarethefont,emphasis,foreground-colourandbackground-colourattributeswhicharecollectivelyreferredtoasrenditionattributes.
【中国标准分类号】:M11
【国际标准分类号】:35_100_05
【页数】:14P.;A4
【正文语种】:英语