RDF Schema
Basic elements for describing ontologies — classes, subclass hierarchies, properties, domains, and ranges using RDF.
Visit WebsiteBrowse the class tree, filter it, and select any class to see its subtree.
When and where you'd use this ontology in practice.
Define lightweight class hierarchies
Specify property domains and ranges
Create simple vocabulary structures
Foundation for OWL ontologies
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Other ontologies in Web Standards.