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