Keyphrases
- relational schema
- xml schema
- xml documents
- xml data
- regular expressions
- relational data
- relational databases
- integrity constraints
- object oriented
- xml queries
- markup language
- xml views
- data exchange
- extended entity relationship
- xml databases
- data representation
- relational model
- semi structured data
- functional dependencies
- conceptual model
- relational database systems
- structured data
- data model
- metadata
- query evaluation
- query optimization
- xpath queries
- entity relationship
- continuous queries
- query language
- high level