Keyphrases
- description logics
- database query languages
- expressive power
- database systems
- relational algebra
- type checking
- query language
- knowledge base
- dl lite
- relational model
- knowledge representation
- complex objects
- data model
- first order logic
- natural language
- database technology
- aggregate functions
- relational database systems
- query optimization
- data types
- database
- database applications
- programming language
- data structure
- machine learning