Keyphrases
- markup language
- data model
- xml data
- xml schema
- extensible markup language
- xml documents
- databases
- object oriented
- database schema
- query language
- general purpose
- database management systems
- semi structured data
- xml queries
- database
- xml databases
- document type definitions
- data types
- database systems
- database design
- data integration
- relational databases
- integrity constraints
- conceptual model
- schema mappings
- data sources
- query processing
- html documents
- conceptual schema
- highly flexible
- schema integration
- data structure