2. 1 RDF Schema for Thesauri Phil Cross University of Bristol, UK

3. 2 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/http://ilrt.org/discovery/2001/01/rdf- thes/

4. 3 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

5. 4 What is RDF? Statement about identifiable objects "The author of the page is Ora" triple(author, page, Ora)

6. 5 An RDF Statement pageOra author

7. 6 In XML/RDF

8. 7 Or Ora

9. 8 Adding further links pageOra author forename email “Ora” “ora@w3.org”

10. 9 What is RDF Schema? Defines types of resources in a particular domain Declares their properties/attributes rdfs:Class & rdfs:Property rdfs:subClassOf & rdfs:subPropertyOf

11. 10 Thesaurus schema Main classes: –Concept –Term Main properties –broaderConcept –relatedConcept –indicator

12. 11 Concepts and Terms /concepts/45 /terms/125 indicator preferred termUsage lang rdf:value “en”“Interpersonal relations”

13. 12 Relationships Between Concepts broaderConcept –If A broaderConcept B –then assume B narrowerConcept A relatedConcept –If A relatedConcept B –then assume B relatedConcept A

14. 13 Classes Concept Term ScopeNote TermUsageValue

15. 14 Properties broaderConcept narrowerConcept indicator conceptCode scope lang termUsage

16. 15 What can it be used for? Standard method for encoding thesaurus data Tested with developing RDF query standards Four thesauri on SOSIGSOSIG MeSH thesaurus on Bristol BioMEDBioMED LIMBER project

17. 16 What can it be used for? Cross-mapping –New Concept properties –fullyEquivalent, broaderEquivalent, etc.? Multilinguality Classification

18. 17 Classification Schema dewey:concepts/id511 dewey:concepts/id233 class:broaderConcept class:schemeName class: notation class:caption class: notation class:schemeName “Dewey Decimal” dewey:captions/id097 dewey:captions/id213 rdf:value “Economics” “Financial economics” class:lang “eng” dewey:notations/id67 “330” rdf:value dewey:notations/id68 “332” rdf:value

19. 18 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: phil.cross@bristol.ac.uk

20. 19 Autoclassification? Concep_ indicator_ 15 Term_56 Concept_ 78 indicative_termindicated_concept weighting method value notationschemeName “330” “0.9” “DDC” “economics” “Lund classifier”