Keyphrases
- data sources
- information integration
- domain ontology
- semantic heterogeneity
- semantic relationships
- databases
- semantic query
- data integration
- query processing
- query language
- heterogeneous data
- knowledge representation
- structured data
- data model
- data sets
- semantic mappings
- query evaluation
- response time
- database
- multiple data sources
- web search engines
- semantic web
- semantically heterogeneous
- domain specific
- data warehouse
- database queries
- query formulation
- answering queries
- deep web data sources
- query rewriting
- heterogeneous data sources
- efficient processing
- topic maps
- semantic relations
- query terms
- first order logic
- information sources
- knowledge base