Keyphrases
- query language
- data model
- expressive power
- database
- query evaluation
- web pages
- relational algebra
- object oriented
- regular expressions
- expert systems
- information extraction
- semi structured
- complex objects
- semistructured data
- data driven
- rule based systems
- html documents
- rule base
- user interface
- genetic algorithm
- recursive queries
- data model and query language
- web browser
- xml data
- data sets
- real time
- information systems
- transitive closure
- multi step
- search engine
- language constructs
- visual query language