ThedevelopmentoftheSemanticWebproceedsinsteps,eachstepbuildingalayerontopofanother.Thepragmaticjustificationforthisapproachisthatitiseasiertoachieve()onsmallsteps,whereasitismuchhardertogeteveryoneonboardiftoomuchisattempted.Usuallythereareseveralresearchgroupsmovingindifferentdirections;this()ofideasisamajordrivingforceforscientificprogress.However,fromanengineeringperspectivethereisaneedtostandardize.So,ifmostresearchersagreeoncertainsuesanddisagreeonothers,itmakessensetofixthepointsofagreement.Thisway,evenifhemoreambitiousresearcheffortsshouldfail,therewillbeatleast()positiveoutcomes.Oncea(请作答此空)hasbeenestablished,manymoregroupsandcompanieswilladoptit,insteadofwaitingtoseewhichofthealternativeresearchlineswillbesuccessfulintheendhenatureofthesemanticwebissuchthatcompaniesandsingleusersmustbuildtools,addcontent,andusethatcontent.Wecannotwaituntilthefullsemanticwebvisionmaterializes-itmaytakeanothertenyearsforittoberealizedtoitsfull()(asenvisionedtoday,ofcourse).
A.technology
B.standard
C.pattern
D.model
正确答案是A