Keyphrases
- rdf data
- sparql queries
- rdf graphs
- query language
- semantic web
- linked data
- storage and retrieval
- resource description framework
- data model
- query processing
- query engine
- semantic web data
- linked open data
- question answer
- web resources
- graph patterns
- graph databases
- relational algebra
- regular expressions
- vector space
- database
- graph model
- answer questions
- query optimization