This seems logical, but I might be missing some edge cases where ISSNs are applicable to a single document.
Remove Document from the domain of issn and eIssn
Yeah, I think I would vote for this change. I don't remember of a usecase for this and I am not sure there are actually documents (specific issues, books, etc) that can have ISSN.
While merging pull requests, any new inputs on that @bdarcus?