Keyphrases
- xml schema
- xml documents
- markup language
- xml data
- integrity constraints
- regular expressions
- xml queries
- data exchange
- relational databases
- data model
- relational schema
- semi structured documents
- object oriented
- conceptual model
- extensible markup language
- metadata
- relational data
- relational model
- functional dependencies
- web services
- semantic information
- building blocks
- xpath expressions
- database systems