POSC Caesar Association (PCA) is a global, nonprofit member organization that shall promote the development of open specifications to be used as standards for enabling the interoperability of data, software and related matters.

We develop, manage, and provide access to standard digital vocabularies (Reference Data/ontologies), including reference data ontologies in W3C’s Web Ontology Language OWL 2 and compliant with an industrial top level ontology, enabling fully machine-readable information and automatic reasoning.
 
Access to our Reference Data Libraries (RDLs) is provided under the terms of the PCA Articles of Association, namely “Reference Data Libraries shall be open, i.e. they can be used by everyone for their own purpose, on equal terms.