PCA is working on the RDL to make a better one. The RDL that is now available at [http://data.posccaesar.org/rdl PCA production endpoint] is based on EXPRESS technology and is presented using RDF reified statement. 

It has been decided that PCA should take advantages of semantic technologies. Therefore, PCA is working on migration of the RDL to ISO 15926-12 DIS which is an OWL 2 native representation of ISO 15926-2.

The PCA RDL is divided into the following parts:

 * Core classes
 * Standard classes
 * Standard profile classes
 * Project classes
 * Chemical classes
 * Research project classes

At the moment, only the core classes have successfully been migrated to ISO 15926-12. It is available at [http://staging.data.posccaesar.org/rdl PCA staging endpoint].