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| Name | Prefix | URL | Details | Comments |
|---|---|---|---|---|
| RDF | rdf | http://www.w3.org/1999/02/22-rdf-syntax-ns# | specification | |
| RDF Schema | rdfs | http://www.w3.org/2000/01/rdf-schema# | specification | |
| Dublin Core | dc | http://purl.org/dc/elements/1.1/ | specification | |
| Dublin Core Terms | dcterms | http://purl.org/dc/terms | specification | Required by OA |
| Dublin Core Types | dctype | http://purl.org/dc/dcmitype | specification | Required by OA |
| Content | cnt | http://www.w3.org/2011/content# | specification | Required by OA |
| Collections | co | http://purl.org/co | specification | |
| Open Annotation | oa | http://www.w3.org/ns/oa | specification | |
| Friend of a Friend | foaf | http://xmlns.com/foaf/0.1 | specification | Also used by OA |
...