Keyphrases
- query language
- sparql queries
- rdf data
- query processing
- data model
- query evaluation
- database
- semantic web
- efficient processing
- response time
- web search engines
- query engine
- query optimization
- complex queries
- database queries
- linked data
- rewriting rules
- query formulation
- relational database systems
- query rewriting
- relational algebra
- retrieval systems
- databases