cco

http://www.ontologyrepository.com/CommonCoreOntologies/ link to namespace URI +1+1

http://purl.org/ontology/cco/core# link to namespace URI +1+1

https://www.commoncoreontologies.org/ link to namespace URI +1+1

http://purl.org/cco/ link to namespace URI +1+1

Add alternative URI
ttl xml rdfa sparql txt json jsonld vann | lov | prefix.cc