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Description
Until now, an agreed rule between you and me, Andrej, is that I use the first docidentifier instance in a bibliographic record as the citation identifier for that record.
This... is informal. Moreover, it is entirely possible for a document to have two or three equally valid citation identifiers issued by different organisations, and to be used simultaneously in citation.
For that reason, I request that you add primary=true to the docidentifier that is intended for citation use—and which has been, until now, the first docidentifier that appears. There may come a time when relaton generates records with multiple primary identifiers.
cc @strogonoff