RDF is used throughout the ACDC system. Some of the vocabularies/ontologies in use include:

• modsrdf
• madsrdf
• dcterms
• geonames
• owl
• skos
• schema.org
• Open Graph
• Library Of Congress

Furthermore, there are a number of custom vocabularies in use.

• Relationships: This vocabulary defines the different fedora object relationships that are used throughout ACDC. (RDF / N3)
• Object Types: This vocabulary maps different object types to the relevant Library of Congress resource types and the Getty (AAT) vocabulary. (RDF / N3)
• License Types: This vocabulary models different Creative Commons license types. (RDF / N3)