Keyphrases
- owl ontologies
- rdf graphs
- semantic web
- owl dl
- rdf schema
- open world
- web ontology language
- formal semantics
- ontology languages
- rdf triples
- description logics
- rdf knowledge bases
- knowledge base
- rdf data
- sparql queries
- linked data
- dublin core
- metadata
- semantic web standards
- markup language
- resource description framework
- learning environment
- semantic description
- domain ontology
- production rules
- closed world
- databases
- semantic web languages
- rule language
- logic programming
- knowledge representation
- data model
- semantic information
- semantic annotation
- relational data
- data sources
- meta information
- query language
- reasoning problems
- semantic data
- constraint language
- knowledge management
- conceptual modeling
- web ontologies
- semantic web technologies
- middle school students