To OpenAIRE/oai_datacite export, add file DOI related identifiers

Overview of the Feature Request

The OpenAIRE/oai_datacite export should include related identifiers for files that Dataverse registers DOIs for, as the DataCite/Datacite export already does. Currently, the OpenAIRE/oai_datacite export does not include this information.

This issue is part of a larger effort to align both metadata exports, described in https://github.com/IQSS/dataverse/issues/11916 and https://github.com/IQSS/dataverse/issues/12281.

What kind of user is the feature intended for?

API User, Superuser, and Sysadmin

What inspired the request?

This is part of a larger effort to align the OpenAIRE/oai_datacite and DataCite/Datacite metadata exports. There is more context at https://github.com/IQSS/dataverse/issues/11916 and https://github.com/IQSS/dataverse/issues/12281.

What existing behavior do you want changed?

Currently, the DataCite/Datacite export includes related identifiers for files that Dataverse registers DOIs for. For example:

<relatedIdentifier
    relationType="HasPart"
    relatedIdentifierType="DOI">10.7910/DVN/YKAMUT/QCHYCL
</relatedIdentifier>

The OpenAIRE/oai_datacite export does not include this information.

The OpenAIRE/oai_datacite export should be changed to include related identifiers for files that Dataverse registers DOIs for, matching the behavior of the DataCite/Datacite export.

Any open or closed issues related to this feature request?

• https://github.com/IQSS/dataverse/issues/11916
• https://github.com/IQSS/dataverse/issues/12281

Start by comparing the OpenAIRE/oai_datacite export with the DataCite/Datacite export, then read issues #11916 and #12281 for the alignment context. The work is done when OpenAIRE/oai_datacite includes the same related identifiers for files with registered DOIs, including the shown HasPart/DOI example.