Keyphrases
- query language
- xml data
- xml format
- xml documents
- update operations
- natural language
- first order logic
- xml schema
- xml queries
- relational and xml data
- xml processing
- data model
- xml query processing
- xml query languages
- query language for xml
- database
- query rewriting
- path expressions
- structured data
- special case
- query processing
- metadata
- information systems