[uf-new] Separating File Content from File Format
Charles Iliya Krempeaux
supercanadian at gmail.com
Thu Apr 5 13:46:48 PDT 2007
On 4/5/07, Scott Reynen <scott at makedatamakesense.com> wrote:
> On Apr 5, 2007, at 2:56 PM, Charles Iliya Krempeaux wrote:
> > Hello Scott,
> > You can find more info about Content Types here...
> > Section 14.17 of RFC 2616
> > http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17
> Hmm, reading that gives me the impression that parameters are defined
> when media types are registered, and aren't something we can add to
> suit our needs.
I don't believe that is the case.
I believe (according to the spec) you are free to create your own
Content Type parameters.
"The presence or absence of a parameter might be significant to the
processing of a media-type, depending on its definition within the
media type registry."
... only implies that there MIGHT be some Content Type parameters
defined with the Media Type registration -- with the MIME Type
I've seen examples in the wild of people creating their own Content
Type parameters to existing registered Media/MIME types. (I've even
done it.) And although that does not prove that doing so is what the
spec says... it is evidence towards it.
> That links to this:
> Which says "The presence or absence of a parameter might be
> significant to the processing of a media-type, depending on its
> definition within the media type registry."
> So the media type registry determines the significance of parameters
> for that media type. In the text/html registry , for example, I
> see "Optional parameters: charset". But in the audio/mpeg registry,
> I see "Optional parameters: none". I couldn't find any discussion of
> parameters specific to video/mpeg, but video/mp4  also says
> "Optional parameters: none", as does video/quicktime . Microsoft
> has, of course, used unregistered X- content types. So what exactly
> does "Optional parameters: none" mean? It seems to suggest we don't
> have the option of parameters on these content types, but maybe I'm
> reading that too literally?
>  http://tools.ietf.org/html/rfc2854
>  http://tools.ietf.org/html/rfc3003
>  http://tools.ietf.org/html/rfc4337
>  http://www.iana.org/assignments/media-types/video/quicktime
Charles Iliya Krempeaux, B.Sc.
charles @ reptile.ca
supercanadian @ gmail.com
developer weblog: http://ChangeLog.ca/
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