Keyphrases
- language constructs
- query language
- programming language
- expressive power
- data model
- object oriented
- relational algebra
- relational data model
- general purpose
- database
- xml data
- high level
- user defined
- complex objects
- modeling language
- data manipulation
- software systems
- data structure
- transitive closure
- software engineering
- query processing
- first order logic
- relational databases
- conceptual model
- databases