Keyphrases
- ontology languages
- semantic web
- description logics
- data complexity
- formal semantics
- conceptual modeling
- data types
- owl ontologies
- owl dl
- query answering
- conceptual models
- web ontology language
- information integration
- reasoning problems
- expressive power
- reasoning services
- answering queries
- rdf schema
- modular ontologies
- semantic annotation
- knowledge base
- conjunctive queries
- data exchange
- first order logic
- knowledge representation
- information technology
- data structure