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Ontology Matching for Linked

Open Data

Shashi Singh

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Concept Introduction

What is Linked Data? set of best practices for publishing and connecting structured data on the Web.!"

Linked Data Sets

#elationship bet$een Linked Data% Se&antic Web andWeb of Data

'Linked Data is the Se&antic Web doneright(

W)C Linking Open Data *ro+ect ,rassroots co&&unity effort to

*ublish e-isting open license datasets as Linked Data on the Web interlink things bet$een different data sources

Continued

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/ feel of ho$ LOD is gro$ing

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#e0ie$ed *apers

Jain, P., Hitzler, P., Sheth, A., Verma, K.: Ontology alignment for linked open data.

1LOOMS is a syste& for finding sche&a2le0el links bet$een LOD datasets in the sense of

Ontology &atching.

3ulius 4ol5!% Christian 1i5er% Martin ,aedke% and ,eorgi 6obilaro0 Disco0ering and

&aintaining links on the $eb of data Data Linking7 Capturing and 8tilising I&plicit Sche&ale0el #elations /ndriy 9ikolo0 4ictoria

8ren :nrico Motta

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Ontology alignment for linked open data.

Main Challenges7

LOD datasets are interlinked these interlinks are &ainly on instance le0el;o$l7sa&e/s there are no established bench&arks or a0ailable baselines for

&easuring precision and recall for LOD sche&a align&ent

> hu&an e-perts fa&iliar $ith the do&ains created referencealign&ents

=he e-perts identified all possible subclass andeui0alence &appings 0ia a subclass or an eui0alencerelationship

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1LOOMS approach

!< *reprocessing of the input ontologies

@< Construction of the 1LOOMS forest

)< Co&parision of the constructed1LOOMS forest

A< *ost *rocessing

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2 Evalation of !e"lt" =hey ha0e co&pared &ore generic sche&a and ha0e used Wikipedia for handling thedi0erse do&ain of LOD. Bollo$ing $ere the shortco&ings of 0arious ontology align&ent syste&s suggested by

3ain et al.

Ontology AlignmentSystem

Issues

#iMOM Bailed due to Ontology si5e

/#OM/ 8nable to find any rele0ant relations

OM4ia8o /ble to find only fe$ correct analogies

/lign&ent >/*I /ble to find fe$ correct analogy but found so&e $rong analogies as$ell

S2Match co&puted correct anlogies but in general e0aluated &any results%$hich resulted in lo$ precision

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Disco0ering and &aintaining links on the $eb of data

=he ,ap > there are tools a0ailable for publishing Linked Data on the Web but there is still a

lack of tools that support data publishers in setting #DB Links to other data sources and to

&aintain #DB links o0er ti&e as data sources change

Design ,oal of Silk $as to fill this gap.

Silk 2 Linking Bra&e$ork% a toolkit for disco0ering and &aintaining data links bet$een Webdata sources

Co&ponents

!< / link disco0ery engine% $hich co&putes links bet$een data sources based on a

declarati0e specification of the conditions that entities &ust fulfill in order to be interlinked.

@< / tool for e0aluating the generated data links in order to fine2tune the linking specification

)< / protocol for &aintaining data links bet$een continuously changing datasources

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Silk Link Disco0ery engine

Main Beatures

2 support the greneration of o$l7sa&e/s links as $ell as other types of #DB links

Ble-ible%declarati0e language for specifying link conditions

Can be e&ployed in distributed en0iron&ents $ithout ha0ing to replicate datasets locally

Capablity of being used $here ter&s fro& different 0ocalbularies are &i-ed and $here no

consistent #DBS or OWL sche&ata e-ist.

Link specification Language

2 Data /ccess

DataSource Directi0e for data access

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2 Link Conditions

LinkCondition section is the heart of a Silk Link Specification

LinkCondition

/4,

M/E

Co&pare *ara&

2 *re2Matching

*reMatchingDefinition source*athFG?aHrdfs7labelG hitLi&itFG!G

Inde- target*athFG?bHrdfs7labelG H

Inde- target*athFG?bHdrugbank7synony&G H

H*reMatchingDefinition

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:0aluating Links

2 #esource Co&parison

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Link Maintenance *rotocol

2 Link =ransfer to target

2 reuest fro =arget Change List

2 Subscription of =arget Changes

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Silk I&ple&entation

Written in *ython

#uns fro& co&&and line

Bra&e$ork can be do$nloaded for&,oogle Code;http7HHsilk.googlecode.co&