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+1 - I've been looking for similar docs and getting similar results for
requested content types.  I found the blog post you linked early on but
eventually found my way back to a few other things once I know what to
search for.  doi.org has a Content Negotiation doc section
which in turn links to crosscite.org

http://www.doi.org/doi_handbook/5_Applications.html#5.4.1
http://crosscite.org/cn/

CrossCite lists a different list of supported types (not atom+xml) at that
URL.  I can't remember which or how many of those I tested, besides
Citeproc JSON, and Unixref XML.

On Thu, 23 Oct 2014, Jonathan Rochkind said:

> Hi, the DOI system supports some metadata lookup via HTTP
> content-negotiation.
> 
> I found this blog post talking about CrossRef's support:
> 
> http://www.crossref.org/CrossTech/2011/04/content_negotiation_for_crossr.html
> 
> But I know DataCite supports it to some extent too.
> 
> Does anyone know if there's overall registrar-agnostic documentation from
> DOI for this service?
> 
> Or, if there's kept-updated documentation from CrossRef and/or DataCite on
> it?
> 
> From that blog post, it says rdf+xml, turtle, and atom+xml should all be
> supported as response formats.
> 
> But atom+xml seems to not be supported -- if I try the very example from
> that blog post, I just get a 406 "No Acceptable Resource Available".
> 
> I am not sure if this is a bug, or if CrossRef at a later point than that
> blog post decided not to support atom+xml. Anyone know how I'd find out, or
> get more information?
> 
> Jonathan

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Michael Berkowski
University of Minnesota Libraries
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