Once the OpenAIRE-funded METIS2OpenAIRE project led by euroCRIS finished as of mid-May, the basis has been laid for the addition of CRIS systems as data providers into the OpenAIRE aggregation. METIS2OpenAIRE set out to enable the exposure of the METIS CERIF-compliant CRIS metadata feed via an OAI-PMH endpoint so that it could be tested against the CERIF-XML Guidelines for CRIS Managers. The project developed a minimally sufficient validator for this purpose. A sample for the 300,000-record meta...