IASSIST 2011 - Representation of the Data Documentation Initiative using Semantic Web Technologies [Thomas Bosch - 02.06.2011]

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37th International Association for Social Science Information Services & Technology (IASSIST 2011) [30.05.2011 - 03.06.2011; Vancouver, Canada]

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IASSIST 2011 - Representation of the Data Documentation Initiative using Semantic Web Technologies [Thomas Bosch - 02.06.2011]

  1. 1. Representation of theData Documentation Initiative using Semantic Web Technologies IASSIST 2011 02.06.2011 Thomas Bosch (research associate, GESIS Leibniz Institute for the Social Sciences)
  2. 2. Agenda• What is the Semantic Web (SW)?• Why should the SW be applied in the context of DDI?• Take-aways and Discussion 2
  3. 3. RDF Triples AgeSubject references Predicate What age? Object 3
  4. 4. Ontologiesclass property class domain range Variable references Question type type type Age What age? referencesresource resource resource 4
  5. 5. Agenda• What is the Semantic Web (SW)?• Why should the SW be applied in the context of DDI?• Take-aways and Discussion 5
  6. 6. Publish and Link DDI Data and Metadata Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/ 6
  7. 7. Semantic Queries• What kinds of problems can be solved?• Queries on multiple, distributed and merged DDI instances• Formulation using DDI domain concepts ?question contains questionScheme ?questionSELECT ?question ?questionWHERE { questionScheme contains ?question. } 7
  8. 8. Integration of Other Ontologies• Ontology domain classes can relate to similar concepts of external ontologies• Reasoner may use additional semantic information DDI Other Ontology Ontologies (Question) (Question) 8
  9. 9. DDI Consistency Check• Definition of consistency• OWL reasoning techniques• Class consistency• Global consistency• Global consistency of DDI ontology Global consistency of DDI data model 9
  10. 10. Concept HierarchyVariable Concept Concept Concept SimilarConceptReference SimilarConcept Difference Reference text + html (superClassOf) 10
  11. 11. Concept Hierarchy Concept subConceptOf hasConceptVariable 11
  12. 12. DDI Elements‘ Comparability Grade_USA hasCode subClassOf A subClassOfVariable Code subClassOf 1.0 subClassOf hasCode Grade_Germany• Necessary conditions (equality, inequality, similarity, …) 12
  13. 13. References OtherMaterial type ExternalURL Citation Relationship Reference RelatedTo DCElements ... ReferenceTitle Creator URN … … ... 13
  14. 14. References OtherMaterial type Drawbacks: ExternalURL Citation Relationship Reference • Complex data model • No intuitive semantics RelatedTo DCElements ... • Bibliographic citation Reference limits • Ensure reusability?Title Creator URN … … ... 14
  15. 15. Semantic References referencesPublicationReferencing Publication IDPublication subClassOf X publicationReferencedBy Variable Title Creator Date URL 15
  16. 16. Agenda• What is the Semantic Web (SW)?• Why should the SW be applied in the context of DDI?• Take-aways and Discussion 16
  17. 17. http://ddiandsemanticweb.blogspot.com Subject Predicate Assertional RDFTriple Ontology Terminological Object

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