So I got curious, nice questions. RFC6838: Expected uses for the "application" type name include but are not limited to file transfer, spreadsheets, presentati

So I got curious, nice questions. RFC6838: Expected uses for the "application" type name include but are not limited to file transfer, spreadsheets, presentations, scheduling data, and languages for "active" (computational) material. "File transfer" sounds to me like the distinction is: if you would expect to show it in a browser directly use audio/text/image/.... - otherwise it's application. This sounds OK for yaml. You _can_ still serve it as text/plain if you want to show it as text, but as yaml it's probably for download purposes. Btw, the RFC discussions are open. You can join an IETF mailinglist and start discussing such topics :-)