Keyphrases
- web databases
- deep web
- databases
- user queries
- database
- database systems
- query interface
- data management
- search engine
- database server
- query relaxation
- data warehousing
- structured data
- web pages
- web users
- key technologies
- data sources
- database technology
- web search
- data warehouse
- semi structured
- information retrieval systems
- data mining