Keyphrases
- xml documents
- xml data
- xml databases
- markup language
- data exchange
- relational databases
- expressive power
- metadata
- xml queries
- databases
- modal logic
- object oriented
- data model
- twig queries
- semi structured
- xml schema
- data transformation
- semi structured data
- relational database systems
- conditional logic
- data representation
- object oriented databases
- document structure
- relational data
- xml format
- propositional calculus
- xpath queries
- semistructured data
- nonmonotonic reasoning
- topic maps
- keyword search
- information retrieval systems
- information extraction
- information retrieval