Keyphrases
- query language
- data model
- xml data
- semistructured data
- data mining query language
- object oriented
- xml documents
- path expressions
- document centric
- xml query languages
- relational algebra
- expressive power
- query evaluation
- structured documents
- database
- keyword search
- xml databases
- data integration
- modal logic
- relational databases
- markup language
- logic programming
- classical logic
- topic maps
- multi valued
- query interface
- database management systems
- xml queries
- object oriented databases
- relational model
- complex objects
- database systems
- xml format
- databases
- xml schema
- conjunctive queries
- data types
- relational data
- data exchange
- metadata
- semi structured
- conceptual model
- data manipulation
- logical framework
- semi structured data
- xpath queries
- query optimization
- relational database systems
- labeling scheme
- transitive closure
- database query languages
- data management