> imply that a particular program (running on an X Windows display)
> is to be called?
If I'm not mistaken the "x-" refers to "experimental". I.e,. these
are not an officially registered MIME types. (There is no X Windows
program called x-tiff, by the way.)
Since these naming schemes serve the same purpose there is no reason
not to have them interoperate; this could be fitted nicely into an
OOP API.
PB