XML模糊結構查詢中檢索結果的自動選取.pdf

1、江西財經(jīng)大學碩士學位論文XML模糊結構查詢中檢索結果的自動選取姓名：蘭月華申請學位級別：碩士專業(yè)：計算機應用技術指導教師：萬常選20091201AbstractAsaselfdescribingandextensiblelanguage，XMLhasbecomeformatsandstandardsforinformationrepresentationanddataexchange，SOthatithasbeenusedwidelya

2、ppliedtovariousfieldsTherefore，therehavegreatprospectsforstudyingtheaccurateretrievalofXMLdocumentsThegranularityoftheresultsiSthebiggestdifferencebetweenXMLDocumentandtraditionaltextretrievalInthe仃aditionaltextretrieval

3、，thegranularityistheentiredocumentthenusersshouldneedtosearchthewholedocumentagaintogettheinformationtheyreallyneedThereforetheretrievalprecisionisalwayslowHoweverinXMLdocumentretrieval，thegranularityoftheresultsisXMLdoc

4、umentfragment，insteadoftheentiredocumentInthiswayitcarlimprovetheretrievalprecisionRetrievalresultsinXMLqueriesareasetofsubtreescontainingkeywordsandthekeyistochoosetherootnodeoftheresultsub—treewhichiStheanswernodeBecau

5、setheXMLdocumenthasseveralelementsofdifferentgranularitiesSOweshouldtochoosewhichnodesasanswernodesItbecomesoneofthekeyissuestohowtochoosereasonableanswernodesUnliketraditionaltextdocument，XMLdocumentiSSemi—stanacturedda

6、taandspecifiesthecontentsaswellasthestructureinformationItCanberetrievedbymeansofnotonlycontentonlyqueriesbutalsocontentandstructurequeriesContentonlyqueriescontainonlyseveralsimplekeywordsSOtheydonotindicatetheanswernod

7、es；IntheCASquerytheanswernodesmaybenotspecified，orifspecified，theyareoftenvague，inaccurateThence，weneedtoinfertheanswernodesfromtheuserqueryexpressionsTheelementnodesintheXMLdocumentCanbecategorizedintofourgroups：entityn

8、odes，connectionnodes，leafnodesandvaluenodesTakingthesemanticintegrityoftheanswernodesintoaccount，thecandidateanswernodesonlycontainsentitynodesandconnectionnodesBasedonthenodes’classification，wecalculatetheconfidenceofea

9、chcandidateanswernodetobetheanswernodewithrespecttothegivenkeywordqueryThentheoneswiththetopnconfidencearechosenastheanswernodesbutnodesshouldberemovedwhichiStheancestorofothernodeThedepthofnodesandkeywordsmatchingshould