1 rdf schema for thesauri phil cross university of bristol, uk
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RDF Schema for Thesauri
Phil CrossUniversity of Bristol, UK
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Background: DESIRE II Project
• Development of Quality Subject Gateways
• Importance of indexing and classification
• Report on conceptual relationships for encoding thesauri and classification systems + RDF Schema
• http://ilrt.org/discovery/2001/01/rdf-thes/
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Why Use RDF?
• Importance as a fundamental layer of the semantic Web
• Standard for encoding metadata• Intended as a means of expressing
relationships between objects: concepts and terms
• Extensible
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What is RDF?
• Statement about identifiable objects
• "The author of the page is Ora" • triple(author, page, Ora)
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An RDF Statement
page Oraauthor
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In XML/RDF
<rdf:description rdf:about="http://ilrt.org/page.html"><author rdf:resource="http://www.w3.org/staffId/85740"/></rdf:description>
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Or
<rdf:description rdf:about="http://ilrt.org/page.html"><author> Ora </author></rdf:description>
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What is RDF Schema?
• Defines types of resources in a particular domain
• Declares their properties/attributes• rdfs:Class & rdfs:Property• rdfs:subClassOf &
rdfs:subPropertyOf
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Thesaurus schema
• Main classes: – Concept– Term
• Main properties– broaderConcept– relatedConcept– indicator
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Concepts and Terms
/concepts/45 /terms/125indicator
preferred
termUsagelang
rdf:value
“en” “Interpersonal relations”
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Relationships Between Concepts
• broaderConcept– If A broaderConcept B– then assume B narrowerConcept A
• relatedConcept– If A relatedConcept B– then assume B relatedConcept A
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Classes
• Concept• Term• ScopeNote• TermUsageValue
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Properties
• broaderConcept• narrowerConcept• indicator• conceptCode• scope• lang• termUsage
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What can it be used for?
• Standard method for encoding thesaurus data
• Tested with developing RDF query standards
• Four thesauri on SOSIG• MeSH thesaurus on Bristol BioMED• LIMBER project
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What can it be used for?
• Cross-mapping– New Concept properties– fullyEquivalent, broaderEquivalent, etc.?
• Multilinguality• Classification
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Classification Schema
dewey:concepts/id511
dewey:concepts/id233
class:broaderConcept
class:schemeName
class: notationclass:caption
class:caption class: notation
class:schemeName
“Dewey Decimal”
“Dewey Decimal”
dewey:captions/id097
dewey:captions/id213
rdf:value
rdf:value
“Economics”
“Financial economics”
class:lang
class:lang
“eng”
“eng”
dewey:notations/id67
“330”
rdf:value
dewey:notations/id68
“332”rdf:value
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References
• Thesaurus schema: http://ilrt.org/discovery/2001/01/rdf-thes/
• SOSIG thesaurus: http://www.sosig.ac.uk/roads/cgi-bin/thesaurus.pl
• LIMBER project: http://jodi.ecs.soton.ac.uk/Articles/v01/i08/Miller/
• email: [email protected]
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Autoclassification?
Concep_indicator_
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Term_56 Concept_78
indicative_term indicated_concept
weightingmethod
value
notation schemeName
“330”
“0.9”
“DDC”“economics”
“Lund classifier”