Re: Registration of media type application/xhtml-voice+xml
"Jonny Axelsson" <jax@opera.com> Thu, 14 July 2005 10:33 UTC
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Date: Thu, 14 Jul 2005 12:31:10 +0200
From: Jonny Axelsson <jax@opera.com>
To: Martin Duerst <duerst@it.aoyama.ac.jp>, Gerald McCobb <mccobb@us.ibm.com>, iana@iana.org, ietf-types@iana.org
Subject: Re: Registration of media type application/xhtml-voice+xml
Cc: "ietf-xml-mime@imc.org" <ietf-xml-mime@imc.org>
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On Thu, 14 Jul 2005 08:49:12 +0200, Martin Duerst <duerst@it.aoyama.ac.jp> wrote: > I agree with that reviewer that the type should not contain > '+' characters except before 'xml'. All other subtypes have used '-' > as a separator. The '+' separator was specifically introduced to > express the fact that the '+xml' part is something more than > a simple subtype. They have used it for a entirely different purpose, as a space (word) substitution. Examples are application/java-byte-code (Java byte code), octet-stream (octet stream), ringing-tones (ringing tones), x-nokia-9000-communicator-add-on-software (Nokia 9000 Communicator add-on software). XHTML+Voice is not "XHTML Voice". Turning the content type for XHTML+Voice into xhtml-voice is bound to cause endless confusion. "Remember that in the MIME type the plus turns into a minus" is exactly that kind of rule that cause authors to be frustrated with Internet standards. > Although there is probably nothing in RFC 3023 explicitly > disallowing the use of '+' for "arbitrary use", I think that > the whole rationale for '+xml' in Appendix A of RFC 3023 > (in particular http://www.ietf.org/rfc/rfc3023.txt, A.12) > seem to indicate that it shouldn't be done. What they did was to examine if their use of '+' caused problems with the existing specs or implementations. In particular they discounted use of parameters though even they were a function of the spec, the existing implementations didn't handle them properly. This examination is something we should do too. If xhtml+voice+xml breaks existing implementations (it doesn't break existing specs, including RFC3023) we shouldn't do it. But this content type has had considerable exposure for several years in its x-xhtml+voice+xml form and we have not encountered a single problem this far. I am not claiming we have exposed it to more than a fraction of the complete net. But consider that no processor should automatically apply XML processing to subtypes like e.g. ccxml xmlcc xml+zz z+xml+z z+xmlz z-xml where (+)xml is in the middle of the string and not at the end, it follows that any algorithm that breaks on xhtml+voice+xml is bound to break on other cases too. Furthermore what would this hypothetical break imply? Unlike parameters (in the spec, poor implemetation record) all processors can handle media types that contain one or more '+' (RFC 3023 is dependent on this too). A failure would either be a false positive ("it has a '+' so it must be XML") or a false negative ("the character following '+' is not 'x'"). A false positive cause no harm (this format is XML), a false negative would lead to processing of application/octet-stream which in practice is something the agent is highly likely to handle rationally too. -- Jonny Axelsson, Core Technology, Opera Software ASA
- Re: Registration of media type application/xhtml-… Bruce Lilly
- Re: Registration of media type application/xhtml-… Gerald McCobb
- Re: Registration of media type application/xhtml-… Bjoern Hoehrmann
- Re: Registration of media type application/xhtml-… Gerald McCobb
- Re: Registration of media type application/xhtml-… Gerald McCobb
- Re: Registration of media type application/xhtml-… Bjoern Hoehrmann
- Re: Registration of media type application/xhtml-… Bjoern Hoehrmann
- Re: Registration of media type application/xhtml-… Jonny Axelsson
- Re: Registration of media type application/xhtml-… Martin Duerst
- Re: Registration of media type application/xhtml-… Gerald McCobb
- Re: Registration of media type application/xhtml-… Chris Lilley
- Re: Registration of media type application/xhtml-… Mark Baker
- Registration of media type application/xhtml-voic… Gerald McCobb
- Re: Registration of media type application/xhtml-… Jonny Axelsson
- Re: Registration of media type application/xhtml-… Bjoern Hoehrmann