Keyphrases
- xml format
- markup language
- metadata
- data model
- topic maps
- xml schema
- relational data
- xml documents
- rdf data
- databases
- xml data
- semantic web
- data interchange
- query language
- data integration
- data exchange
- linked data
- data transformation
- rdf graphs
- xml databases
- structured data
- relational databases
- xml queries
- xml files
- extensible markup language
- stored in relational databases
- semistructured data
- formal semantics
- twig queries
- xml retrieval
- data storage
- object oriented databases
- keyword search
- knowledge base