Keyphrases
- selectivity estimation
- sparql queries
- query optimization
- graph patterns
- rdf data
- query processing
- database systems
- cost model
- graph mining
- semantic web
- query language
- storage and retrieval
- query execution
- query evaluation
- linked data
- spatial join
- graph databases
- xml queries
- relational algebra
- graph model
- data management
- data model
- xml data
- query plan
- regular expressions
- databases