Re: [apps-discuss] Last Call: <draft-ietf-appsawg-mime-default-charset-03.txt> (Update to MIME regarding Charset Parameter Handling in Textual Media Types) to Proposed Standard

Julian Reschke <julian.reschke@gmx.de> Fri, 11 May 2012 14:49 UTC

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Date: Fri, 11 May 2012 16:49:11 +0200
From: Julian Reschke <julian.reschke@gmx.de>
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To: "t.petch" <ietfc@btconnect.com>
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Cc: Barry Leiba <barryleiba@computer.org>, Ned Freed <ned.freed@mrochek.com>, apps-discuss@ietf.org
Subject: Re: [apps-discuss] Last Call: <draft-ietf-appsawg-mime-default-charset-03.txt> (Update to MIME regarding Charset Parameter Handling in Textual Media Types) to Proposed Standard
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On 2012-05-11 14:59, t.petch wrote:
> What charset should be used to inspect the content?  Should this be defined in
> this I-D?
>
> The new rules say that
> "charset" parameter is not used for the defined
>         subtype, because the charset information is transported inside
>         the payload (such as in "text/xml")
>
>   But a charset is needed in order to read the payload and determine that
> charset.  Catch-22?
>...

No. Just not trivial.

See for instance <http://www.w3.org/TR/REC-xml/#sec-guessing>; HTML5 has 
similar (but surely more complex) rules.

Best regards, Julian