Our OAI-PMH service is one of the common ways we offer to harvest our public metadata, and we are happy to let you know that we are launching a new version. This technology refresh allows us to continue supporting the OAI-PMH service. For the most part, there is no functional change, we adhere to the OAI-PMH standards and have attempted to keep the service as backward compatible as possible.
More information here https://blog.datacite.org/oaipmh-service-updates/