Here in the UK there’s a growing expectation from funders here in the UK to assign a unique PID to Authors’ Accepted Manuscripts deposited in an OA repository (i.e. different from the PID for the Version of Record). Whether or not to use DOIs for this is an ongoing debate, but where it is done we are recommending people make liberal use of relatedIdentifier to minimise any possible confusion over the duplication. For example:
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IsVersionOforIsOriginalFormOfto link from the AAM to the VoR -
IsIdenticalToto link between copies of the same AAM held in different institutional repositories
It would be interesting to hear any thought folks have on further refining the relationType controlled list to better characterise these relationships, as that would definitely improve DOI’s suitability for this use case.