Keyphrases
- knowledge representation
- xpath queries
- database
- query language
- semantic query optimization
- response time
- query processing
- user defined
- data model
- query interface
- knowledge acquisition
- natural language processing
- semantic data model
- database schema
- semantic web
- artificial intelligence
- query evaluation
- databases
- database objects
- query logs
- database views
- retrieval systems
- xml data
- description logics
- expert systems
- natural language
- integrity constraints
- range queries
- knowledge base
- relational tables
- efficient processing
- information retrieval
- database systems
- relational data model
- structured queries
- semistructured data
- data sources
- web databases
- information retrieval systems
- user queries