Keyphrases
- conceptual graphs
- intended meaning
- logic programming
- semantic information
- formal semantics
- temporal relations
- lexical semantics
- binary relations
- deductive databases
- semantic relationships
- relational data model
- null values
- datalog queries
- relational algebra
- relational databases
- spatial relations
- cardinality constraints
- relational calculus
- algebraic structure
- algebraic operations
- semantic relations
- co occurrence