Keyphrases
- xml schema
- relational schema
- extended entity relationship
- xml documents
- relational databases
- data exchange
- object oriented
- integrity constraints
- regular expressions
- semi structured documents
- xml data
- metadata
- relational model
- markup language
- entity relationship
- normal form
- relational data
- building blocks
- functional dependencies
- source schema
- data model
- conceptual schema
- semantic web
- information retrieval