Keyphrases
- dl lite
- data types
- description logics
- ontology languages
- query answering
- data complexity
- data model
- data structure
- database systems
- first order logic
- expressive power
- query rewriting
- computational complexity
- database management systems
- conjunctive queries
- reasoning tasks
- knowledge base
- data exchange
- data mining algorithms
- data mining
- semantic web
- np complete
- knn
- computational properties
- xml documents