Keyphrases
- markup language
- xml format
- metadata
- topic maps
- xml schema
- relational data
- xml documents
- data model
- rdf data
- xml data
- databases
- semantic web
- data integration
- data interchange
- rdf graphs
- xml databases
- data transformation
- data exchange
- xml files
- linked data
- sql queries
- xml queries
- object oriented
- xml retrieval
- data sources
- dublin core
- stored in relational databases
- structured data
- relational databases
- database systems
- sparql queries
- document structure
- update operations
- formal semantics
- query language
- extensible markup language
- knowledge base