Keyphrases
- xml schema
- xml documents
- integrity constraints
- regular expressions
- object oriented
- xml data
- data exchange
- semi structured documents
- conceptual model
- markup language
- building blocks
- relational databases
- schema mappings
- relational model
- relational schema
- databases
- database design
- data management
- high level
- metadata
- context free grammars
- extensible markup language