August 2011
Intermediate to advanced
476 pages
15h 31m
English
Content preview from Applied Semantic Web Technologies
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372 ◾ Jon Atle Gulla et al.
<owl:Class rdf:ID=”DegreeCourseSchema”>
<rdfs:subClassOf>
<owl:Restriction>
<owl:onProperty rdf:resource=”#vtStart”/>
<owl:hasValue rdf:datatype=”&xsd;date”>
1990-01-01
</owl:hasValue>
</owl:Restriction>
...
Since OWL does not allow such time stamps to be added to relations (data proper-
ties or object properties), their approach cannot be used to model evolving ontol-
ogies in general. Van Atteveldt et al. (2008) solve this problem by modeling all
properties as time-stamped classes, leading to an ontology that is problematic for
reasoning and structural clarity. A more conventional appr ...
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