Keyphrases
- complex queries
- cost model
- casual users
- linked open data
- web applications
- query optimization
- database
- digital libraries
- semantic web
- queries involving
- website
- learning objects
- linked data
- user queries
- rewrite rules
- web documents
- web mining
- query processing
- information extraction
- structured queries
- data repositories
- web content
- information sources
- web pages