Keyphrases
- xml documents
- xml data
- relational data
- markup language
- xml queries
- databases
- metadata
- xml databases
- xml schema
- semi structured data
- data integration
- data exchange
- database
- data sets
- xml retrieval
- extensible markup language
- xml format
- semi structured documents
- xpath queries
- relational database management systems
- object oriented databases
- data model