Keyphrases
- data complexity
- expressive power
- query answering
- query evaluation
- conjunctive queries
- combined complexity
- block cipher
- lower complexity
- exptime complete
- np complete
- query complexity
- ciphertext
- ontology languages
- encryption algorithm
- double exponential
- regular path queries
- integrity constraints
- lower bound
- dl lite
- answering queries
- datalog programs
- relational databases
- monadic second order logic
- data mining