You CAN use application/xml for any XML, but it's often useful to have a specific type for your specific content, so the user-agent can know what to do with it. The convention is to include "+xml" on the end, so if the user agent doens't know your specific format, it can fall back to treating it as generic XML. For instance: application/rss+xml application/atom+xml application/rdf+xml And dozens more you can see at: http://www.iana.org/assignments/media-types/application/ (search for "+xml"). Thanks to Mark and Ross Singer for pointing out application/marc already exists. (and is on that list above). Awesome. I'm still feeling the need for application/marc+xml, and application/mods+xml Jonathan Ethan Gruber wrote: > Correct me if I'm wrong, but wouldn't the mime type for MARC-XML and MODS be > application/xml, like every other xml file? As for MARC-binary, I can't > say. I don't have any of those files handy. > > Ethan > > On Wed, Feb 4, 2009 at 10:47 AM, Jonathan Rochkind <[log in to unmask]> wrote: > > >> I am actually rather shocked that it seems that MARC-XML, MODS, >> MARC21-binary, do not have registered Internet Content Types (aka MIME >> types). >> >> Am I missing something, or is this really so? >> >> Anyone know what the process is for registering such? Anyone want to help >> try to do that? I guess we'd probably have to talk to the standards >> organizations for each of those types, rather than doing it independently? >> >> Jonathan >> >> > >