Keyphrases
- xml schema
- xml data
- xml documents
- document type definitions
- structure of xml documents
- data model
- databases
- extensible markup language
- object oriented
- database schema
- definition language
- regular expressions
- language learning
- programming language
- relational schema
- semantic constraints
- relational databases
- natural language
- conceptual model
- semistructured data
- semantically equivalent
- high level
- integrity constraints
- language processing
- target language
- schema evolution
- query processing
- data interchange