Keyphrases
- xml keys
- xml documents
- xml data
- referential integrity
- xml queries
- semantic properties
- markup language
- metadata
- document centric
- xml fragments
- constraint language
- xml schema
- data integration
- object oriented
- data exchange
- logic programming
- derivation rules
- databases
- relational databases
- data model
- definition language
- conceptual schema
- data management
- query containment
- xml retrieval
- semantic web
- xml databases
- semantic information
- semi structured