Request for review of CEA Task Model Description media type:application/cea-2018+xml

Gottfried Zimmermann gzimmermann at
Thu Jul 31 11:39:16 CEST 2008

Bjoern, Martin,

thanks for your review.

It sounds like both options (with or without optional charset parameter)
should be acceptable since UTF-8 is the required encoding.

BTW, there is already an application/*+xml registration that does not have a
charset parameter: application/oebps-package+xml, see  This one allows two encoding: UTF-8
and UTF-16.


> -----Original Message-----
> From: Martin Duerst [mailto:duerst at]
> Sent: Thursday, July 31, 2008 3:57 AM
> To: Bjoern Hoehrmann; gzimmermann at
> Cc: ietf-types at; iesg at; 'Charles Rich'; 'Leslie King'
> Subject: Re: Request for review of CEA Task Model Description media
> type:application/cea-2018+xml
> I'm not sure I agree fully with Bjoern. If you have something like
> Content-Type: application/cea-2018+xml;charset=example
> then that's simply an error as per the registration.
> There is no need that erroneous content behave the same on all
> implementations; garbage in means garbage out.
> Regards,   Martin.
> At 20:35 08/07/30, Bjoern Hoehrmann wrote:
> >* Gottfried Zimmermann wrote:
> >>The Consumer Electronics Association (CEA) has released standard
> >>CEA-2018 on Task Model Descriptions (see
> >
> >>Registration Request:
> >>
> >>Type name: application
> >>
> >>Subtype name: cea-2018+xml
> >>
> >>Required parameters: none
> >>
> >>Optional parameters: none
> >>
> >>   Note that (in contrast to application/xml) no charset parameter is
> >>defined since CEA-2018 specifies UTF-8 as the required file format.
> >
> >I do not think this is a valid reason to omit the charset parameter.
> Do
> >note that including the charset parameter is a SHOULD-level
> requirement
> >of RFC 3023 for +xml types. If you truly need to omit the parameter,
> it
> >would be better to omit the +xml from the name.
> >
> >The reason is that, if you actually have a `application/cea-2018+xml;
> >charset=example` resource a tool with no knowledge of the specific
> type
> >it would consider it to be in the `example` encoding, whereas CEA-2018
> >applications would probably ignore the parameter and assume UTF-8.
> >
> >A better solution would be to have an optional charset parameter and
> >e.g. require consumers of the type to reject content that specifies
> the
> >parameter with a value indicating some other encoding than UTF-8, or
> >whatever is done with entites that have a non-UTF-8 BOM or XML
> encoding
> >declaration.
> #-#-#  Martin J. Du"rst, Assoc. Professor, Aoyama Gakuin University
> #-#-#
> mailto:duerst at

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