Keyphrases
- query evaluation
- query language
- query engine
- conjunctive queries
- deductive databases
- sparql queries
- query processing
- data model
- transitive closure
- xml data
- data management
- data complexity
- probabilistic databases
- efficient query evaluation
- expressive power
- querying xml documents
- query optimization
- computational complexity
- regular expressions
- linked data
- relational algebra
- semantic web
- np complete
- rdf data
- disjunctive deductive databases
- data sets
- database
- inverted lists
- tree pattern queries
- np hard
- databases