Keyphrases
- keyword search
- rdf graphs
- query language
- linked data
- keywords
- relational databases
- structured data
- search engine
- semantic web
- xml databases
- xml data
- data model
- semantic search
- xml keyword search
- keyword queries
- xml documents
- relational algebra
- expressive power
- sparql queries
- keyword search over relational databases
- search queries
- rdf data
- query evaluation
- object oriented
- information extraction
- database
- metadata
- information retrieval
- xml queries
- keyword search in relational databases
- graph structure
- semi structured
- web search engines
- query processing
- machine learning