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1、LexicalIssuesinNaturalLanguageProcessingTedBriscoeUniversityofCambridgeComputerLaboratoryNewMuseumsSite,PembrokeStreet,Cambridge,CB23QG,UKNovember1991(inE.KleinandF.Veltman(eds.),NaturalLanguageandSpeech,Springer-Verlag,1991)ESPRITBRA-3030ACQUILEXWorkingPaperNo041LexicalI
2、ssuesinNaturalLanguageProcessingTedBriscoeComputerLaboratory,UniversityofCambridgePembrokeStreet,Cambridge,CB23QG,UKejb@cl.cam.ac.uk1IntroductionInthispaper,Iwillbrie
ydescribetheroleofthelexiconinnaturallanguageprocessing(NLP)applicationsandwillgoontodiscussanumberofissu
3、esinlexicalresearchandinthedesignandconstructionoflexiconsforpracticalNLPapplications.IwillsurveyrelevantresearchinEurope,AmericaandJapan;however,inapaperofthislengthitisnotpossibletoconsidereveryinstanceofaparticularapproach,soneitherthetextnorreferencesshouldbetakentobe
4、exhaustive.Inrecentyears,thelexiconhasbecomethefocusofconsiderableresearchin(computational)linguistictheoryandNLP;thereasonsforthistrendareboththeoreticalandpractical.Withinlinguistics,theroleofthelexiconhasincreasedasmoreandmorelinguisticgeneralisationshavebeenseentohave
5、alexicaldimension.WithinNLP,thelexiconhasincreasinglybecomethechief`bottleneck'intheproductionofhabitableNLPsystemso eringanadequatevocabularyfortheintendedapplication.Thishasledtotheuseofmachine-readableversionsofconventionaldic-1tionariesinanattempttodevelopsubstantiall
6、exiconsforNLPinaresourceecientfashion.Atthesametime,dictionarypublishersandlexicographershaverealisedthepotentialbene tsofinformationtechnologyinthedictionaryproductionprocessandalsothepotentialnewmarketsfortheirproductsthatmightbecreatedbycommercialdevelopmentoflanguage
7、technologies.Thislatterpossibilitycreatestheveryexcitingopportunityforcollaborativeresearchanddevelopmentbetweentheseapparentlyratherdisparatecommunitieswhich,Ibelieve,wouldsubstantiallyre-movetheexistingbottleneckforNLPsystemsandwouldprovideamajorimpetustotheoreticalrese
8、archonthelexicon.Inthenextsection,Ireviewrelevantresearchinrecentlinguistictheoryanddescribetheh
