Keyphrases
- metadata
- description logics
- semantic web
- semantic annotation
- oai pmh
- expressive power
- gene ontology
- information systems
- knowledge base
- web services
- annotation tool
- digital libraries
- meta information
- image annotation
- interoperability issues
- formal logic
- computational complexity
- conjunctive queries
- semantic interoperability
- database
- semantic technologies
- computational properties
- manual annotation
- information sharing
- keywords
- data sets