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DataCite requires that new DOIs have associated metadata that adheres to a schema that they revise occasionally. The current version of their schema is v4.1 (Oct 2017). Metadata that we register have registered through EZID is adherent to v2.2 (Jul June 2011), v3, and v4. It is unclear if/when DataCite will deprecate v2.2 and no longer accept it. In another attempt to future-proof our DOI minting service, we will only submit metadata adherent to v4.1.
As a result of this, we must be able to retrieve metadata adherent to schemas 2.2 and 4.1 + in order for the client to update it. We can create a translator tool to convert data from both these schemas to an intermediate object (see DoiMetadata above) that can hold the appropriate metadata. This object can be translated into the most recent version of the schema. The client can retrieve and submit this object by interfacing with our API
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