Keyphrases
- xml schema
- semi structured documents
- xml documents
- document centric
- metadata
- xml data
- structure of xml documents
- regular expressions
- integrity constraints
- markup language
- relational databases
- extensible markup language
- object oriented
- data interchange
- structured data
- semantic information
- data exchange
- relational schema
- information retrieval systems
- free text
- xpath expressions
- conceptual model
- database
- data model
- semi structured
- document collections
- user interface
- information retrieval
- schema mappings
- relational data
- web documents
- context free grammars
- web pages