Keyphrases
- ontology languages
- semantic web
- description logics
- formal semantics
- data complexity
- conceptual modeling
- owl dl
- data types
- conceptual models
- owl ontologies
- query answering
- reasoning problems
- rdf schema
- information integration
- knowledge base
- web ontology language
- reasoning services
- expressive power
- modular ontologies
- np complete
- semantic annotation
- conceptual model
- integrity constraints