Keyphrases
- relational data
- relational databases
- formal semantics
- data model
- transformation rules
- relational learning
- relational operators
- database query languages
- algebraic operations
- aggregate functions
- statistical relational learning
- database schema
- conceptual model
- logic programming
- genetic algorithm
- semantic representation
- entity relationship
- schema mappings
- relational structures
- semantic information
- database language
- xml documents
- natural language