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A Distance-based Semantic Search Algorithm for Peer-to-Peer Open Hypermedia Systems

Abstract. We consider a collaborative application scenario in Open Hypermedia Systems. We describe a semantic search algorithm to discover semantically equivalent or related resources across distributed link databases, otherwise known as linkbases. Our app

ASemanticSearchAlgorithmforPeer-to-Peer

OpenHypermediaSystems

JingZhou,VijayDialani,DavidDeRoure,andWendyHall

UniversityofSouthampton,SouthamptonSO171BJ,UnitedKingdom,

jz00r,vkd00r,dder,wh@ecs.soton.ac.uk

Abstract.WeconsideracollaborativeapplicationscenarioinOpenHypermediaSystems.Wedescribeasemanticsearchalgorithmtodis-coversemanticallyequivalentorrelatedresourcesacrossdistributedlinkdatabases,otherwiseknownaslinkbases.Ourapproachdi ersfromtra-ditionalcrawlerbasedsearchmechanismsbecauseitreliesonclusteringofsemanticallyrelatedentities.Itcreatesclustersofrelatedsemanticentitiestoexpeditethesearchforresourcesinarandomnetwork.Itusesadistance-vectorbasedheuristictoguidethesearch.Ourresultscon rmthatthealgorithmyieldshighsearche ciencyincollaborativeenviron-mentswherethechangeincontentpublishedbyeachparticipantisrapidandrandom.

1Introduction

OpenHypermedia[20]isamodelthathasbeenadoptedbythehypertextcom-munityformanyyears.Itisprincipallycharacterizedbyhavinghypermedialinkinformationstoredseparatelyfromthedocumentsthatitdescribes.Thelinksarestoredinlinkbases.Thisapproachallowslinkstobemanagedandmain-tainedseparatelyfromthedocuments,andthatdi erentsetsoflinkscanbeappliedtoasetofdocumentsasappropriate.

Thedevelopmentofthe rstOpenHypermediaSystem(“Microcosm”[12])predatestheWeb.The rstimplementationoftheMicrocosmphilosophyontheWebwastheDistributedLinkService(DLS)[5][11].ThiswasextendedsothatlinkresolutionwasalsodistributedaroundtheWeb[10],andtheserviceparadigmnowextendstorecentdevelopmentssuchasontologyservices[7].COHSE[7]providestoolsfortheSemanticWebthatbuildsupontheconceptoftheDLSandontologies.

TheSemanticWeb[2]augmentscurrentWebtechnologiesbyassociatingmachineunderstandableannotations(a.k.a.metadata)withcontents.Metadataprovidesanabstractrepresentationofinformationandisprimarilyproducedtofacilitateinferencetechniquestoco-relateinformationfromdi erentproviders.CurrentsearchtechniquesusedinSemanticWebtechnologiesfocusonanno-tatingstaticinformationandfailtotakeintoconsiderationdynamicandasyn-chronousvariationincontents.Itshouldbenotedthat,thoughsomemaycon-siderservicesbasedarchitectureslikeDAML-S[1],whichuseSemanticWeb

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