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Re: UTF-16 and MIME text/*

From: Yung-Fong Tang <ftang@netscape.com>
Date: Tue, 14 Aug 2001 12:20:24 -0700
Message-ID: <3B7979F8.527356F1@netscape.com>
To: John Cowan <cowan@mercury.ccil.org>
CC: Bjoern Hoehrmann <derhoermi@gmx.net>, www-international@w3.org, phoffman@imc.org
John:
If you are right, then EDBIC is not allowed neither, right ?
Also, is that ture that CRLF in "text/html" does not mean a "line break" neither,
except inside <PRE> tag.

John Cowan wrote:

> Bjoern Hoehrmann scripsit:
> > * John Cowan wrote:
> > >Bjoern Hoehrmann scripsit:
> > >
> > >>    RFC 2871 registers all UTF-16 charsets (UTF-16BE, UTF-16LE and
> > >> UTF-16) as not suitable for use in MIME content types under the
> > >> "text" top-level type. Why?
> > >
> > >Because a MIME processor, when encountering something of type text/*,
> > >is allowed to assume that any 0x0A byte means "LF" and any 0x0D byte means "CR",
> > >and to transmute them to some other kind of line ending.  UTF-16
> > >of whatever flavor violates this rule.
> >
> > Could you please give me some reference where MIME allows applications
> > to _transmutate_ them? Someone poited out to me, that RFC 2871 is in
> > error here and I tried hard to find something in MIME that clearly
> > states, that RFC 2871 is correct in this regard.
>
> The word "transmute" was ill-chosen.  RFC 2046, section 4.1.1, is quite
> clear:
>
> # The canonical form of any MIME "text" subtype MUST always represent a
> # line break as a CRLF sequence.  Similarly, any occurrence of CRLF in
> # MIME "text" MUST represent a line break.  Use of CR and LF outside of
> # line break sequences is also forbidden.
> #
> # This rule applies regardless of format or character set or sets
> # involved.
>
> CR and LF here refer to the *octets* 0xD and 0xA respectively, as
> explained in section 4.1.2, not to the characters.
>
> --
> John Cowan                                   cowan@ccil.org
> One art/there is/no less/no more/All things/to do/with sparks/galore
>         --Douglas Hofstadter
Received on Tuesday, 14 August 2001 15:23:20 GMT

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