Mime types - uppercase appearing in mime type names

Thomas Kluyver thomas at kluyver.me.uk
Fri Mar 15 15:11:47 PDT 2013

Almost all Mime types are named in lower case, e.g. image/png. However,
there are a handful of MS office file formats that the
freedesktop.orgdatabase uses the word 'macroEnabled', e.g.


The same type is also defined by LibreOffice, but in lowercase, i.e.

I also see uppercase in audio/AMR, audio/AMR-WB and text/x-iMelody.

RFC 2045 [1] says "The type, subtype, and parameter names are not case
sensitive." I can flatten the case easily enough, but looking up the
MEDIA/SUBTYPE.xml files on a case-sensitive filesystem gets tricky - I
would have to keep a reference to the original spelling, just for those few

To simplify this, I think the shared mime-info spec should say that the
media/subtype.xml files are always named in lowercase. Since the names are
supposed to be case insensitive, it shouldn't create conflicts.

update-mime-database should also merge mimetypes regardless of case - at
present, I see separate media/subtype.xml files for the 'macroEnabled' and
'macroenabled' mimetypes.


[1] http://tools.ietf.org/html/rfc2045
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