Keyphrases
- database language
- information retrieval
- document retrieval
- language learning
- programming language
- natural language
- relational databases
- text retrieval
- image database
- information retrieval systems
- retrieval systems
- xml query languages
- multimedia databases
- test collection
- data model
- efficient retrieval
- relational data
- image retrieval
- query formulation
- rewriting rules
- algebraic operations
- digital libraries
- structured documents
- conceptual graphs
- query expansion
- relevance feedback
- retrieval model
- aggregate functions
- high level
- object oriented
- database