Conflicting mime types

Jerome Leclanche adys.wh at
Tue Mar 5 03:58:55 PST 2013

Are they valid PNGs? If so, it sounds like the mime type should just be a
child of image/png and drop the glob here.

J. Leclanche

On Tue, Mar 5, 2013 at 11:29 AM, Thomas Kluyver <thomas at>wrote:

> I've just had a bug reported against PyXDG that a Mimetype test is
> returning image/x-apple-ios-png instead of image/png.
> Looking at the XML mime type definitions [0], this new mime type ('Apple
> broken PNGs') has the same glob as regular pngs: *.png. They can be
> distinguished by magic sniffing, but the test in question is specifically
> for when only a filename is available.
> Obviously, a filename like foo.png should be presumed to be image/png over
> image/x-apple-ios-png. But how should this be done? Should we prefer
> mimetypes without the x- prefix? Could there be a collision between two
> mimetypes neither of which have an x-? Is there some other heuristic we can
> use?
> [0]
> Thanks,
> Thomas
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