Keyphrases
- query language
- data model
- expressive power
- rule language
- rdf knowledge bases
- rdf graphs
- knowledge representation
- query evaluation
- semantic web
- ontology languages
- rdf data
- database
- object oriented
- recursive queries
- relational algebra
- object oriented programming language
- owl ontologies
- knowledge base
- transitive closure
- complex objects
- conjunctive queries
- data complexity
- regular expressions
- structured documents
- sparql queries
- semantic web technologies
- case study
- domain specific
- constraint language
- information systems
- databases
- data sets