Keyphrases
- query evaluation
- conjunctive queries
- query language
- query processing
- query processing strategies
- data complexity
- deductive databases
- xml data
- transitive closure
- data management
- disjunctive deductive databases
- probabilistic databases
- regular expressions
- distributed systems
- efficient query evaluation
- databases
- querying xml documents
- null values
- inverted lists
- query engine
- signature file
- probabilistic xml
- query answers
- special case
- data mining