Workshop presentation: Semantic Statistics for Social, Behavioural, and Economic Sciences: Leveraging the DDI Model for the Web (12.09.2011 - 16.09.2011)

1. Representation of the
Data Documentation Initiative using
Semantic Web Technologies
Workshop on Semantic Statistics
12.09.2011 – 16.09.2011
Thomas Bosch
(research associate, GESIS Leibniz Institute for the Social Sciences)

2. Agenda
• Use Cases
• Take-aways and Discussion
2

3. Publish and Link DDI Data and Metadata
Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/ 3

4. 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 ?question
SELECT ?question ?question
WHERE { questionScheme contains ?question. } 4

5. Integration of Other Ontologies
• Domain ontologies' classes can relate to
similar concepts of external ontologies
• Reasoner may use additional
semantic information
DDI
Other
Domain
Ontologies
Ontology
(Question) (Question)
5

6. DDI Consistency Check
• Definition of 'consistency'
• OWL reasoning techniques
• Class consistency
• Global consistency
• Global consistency of DDI ontology
Global consistency of DDI data model
6

7. Concept Hierarchy
Variable Concept Concept
Concept
SimilarConcept
Reference
SimilarConcept
Difference
Reference
text + html
(superClassOf)
7

8. Concept Hierarchy
Concept subConceptOf
hasConcept
Variable
8

9. DDI Elements‘ Comparability
Grade_USA
hasCode
subClassOf
A subClassOf
Variable Code
subClassOf
1.0
subClassOf
hasCode
Grade_Germany
• Necessary conditions (equality, inequality, similarity, …)
9

10. References
OtherMaterial type
ExternalURL
Citation Relationship
Reference
RelatedTo
DCElements ...
Reference
Title Creator URN
… … ...
10

11. References
OtherMaterial type
Drawbacks:
ExternalURL
Citation Relationship
Reference
• type
• complex data model
RelatedTo
DCElements ... • no intuitive semantics
Reference
• bibliographic citation
limits
Title Creator URN
• ensure reusability?
… … ...
11

12. Semantic References
referencesPublication
Referencing
Publication ID
Publication
subClassOf
X
publicationReferencedBy
Variable Title Creator Date URL
12

13. Agenda
• Use Cases
• Take-aways and Discussion
13

14. http://ddiandsemanticweb.blogspot.com
Concept
SPARQL
Hierarchies Queries
Consistency
References
LOD Cloud
Use Cases
Comparability Ontology
Integration