Keyphrases
- owl dl
- sparql queries
- semantic web
- rdf data
- description logics
- ontology languages
- domain ontology
- reasoning systems
- relational algebra
- graph model
- rdf graphs
- linked data
- query language
- reasoning problems
- query formulation
- query optimization
- knowledge representation
- cost model
- knowledge base
- graph patterns
- sql queries
- database systems
- formal semantics
- knowledge management
- query processing