Every Contributor exported as Author in COinS export
Every contributor is exported as author "rft.au" in the COinS export, regardless whether this is an author, editor, bookeditor, translator, ... Is this a bug or feature? (COinS has IMO no possibility to save contributors, which are not authors.)
1. The status quo: priorities not losing data over getting creator types right.
2. Reverse this: only export authors
3. Find a way to distinguish in COinS. Like you, I don't think we can do this, but haven't looked at this in any depth.
Edit: yeah, nvm. DC is not nearly rich enough. It's a shame we can't define arbitrary namespaces and use them as we do in RDF export.
Thus, I would also tend to 2. However, every publication should have a creator, and therefore it might be an option, that if there are no authors present in an item, to export some other contributors as authors. E.g. if there are no authors, then we would also export book authors. However, if there are three bookauthors but the chapter is just written by one of them, then we should only export one author in COinS.
It seems that wikipedia it also ignoring editors in their example of a COinS export at https://en.wikipedia.org/wiki/Wikipedia:COinS
Surveying a few other implementations: CiteULike and VUFind do not include editors in COinS. COPAC does. OCLC seems to label editors as authors (in both the human-readable page and in COinS).
I'm OK with 2. then.
Please, also, try to avoid using COinS as a medium for transferring bibliographic metadata. As stated above, COinS is useful primarily for OpenURL linking (and it functions satisfactorily for that purpose).
I do hope no one uses COinS to transfer bib data, but it does remain the easiest way to quickly implement bibliographic data into a webpage in a way that's readable by multiple reference managers.