Keyphrases
- ontology languages
- semantic web
- description logics
- data complexity
- formal semantics
- data types
- conceptual modeling
- modular ontologies
- owl ontologies
- owl dl
- query answering
- conceptual models
- information integration
- expressive power
- np complete
- answering queries
- query evaluation
- inference rules
- database
- object oriented
- fuzzy logic
- query language
- database systems
- knowledge base
- machine learning