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Re: Proposed resolution of HRRI/IRI discussion

From: Martin Duerst <duerst@it.aoyama.ac.jp>
Date: Tue, 06 Nov 2007 18:38:09 +0900
Message-Id: <>
To: Richard Tobin <richard@inf.ed.ac.uk>, Konrad Lanz <Konrad.Lanz@iaik.tugraz.at>
Cc: Richard Tobin <richard@inf.ed.ac.uk>, "Grosso, Paul" <pgrosso@ptc.com>, Richard Ishida <ishida@w3.org>, public-i18n-core@w3.org, public-xml-core-wg@w3.org, public-iri@w3.org

I think one additional argument for not including '[' and ']'
in escaping when going from Legacy Extended IRIs to IRIs is
that for all the other characters, this can be done independent
of syntax details, but for '[' and ']', it would have to be
done in a context-dependent manner, because clearly these
characters must not be escaped when they serve as delimiters
for IPv6 addresses.

Regards,    Martin.

At 18:10 07/11/06, Richard Tobin wrote:
>> >> If LEIRIs said that square brackets in the fragment get %-escaped
>> >> by the processor, and we changed the specs to refer to LEIRIs, that
>> >> would be a normative change.
>> That depends on the perspective ... (RFC 2732 Grammar vs. Prose)
>But we're not talking about RFC 2732, we're talking about XML 1.0,
>XInclude, the XPointer draft and so on.  And they don't rely on 2732
>for the list of characters, even if they refer to it.  For example,
>the XPointer draft http://www.w3.org/TR/2001/CR-xptr-20010911/#escaping
>  The disallowed characters include all non-ASCII characters, plus the
>  excluded characters listed in Section 2.4 of [IETF RFC 2396], except
>  for the number sign (#) and percent sign (%) and the square bracket
>  characters re-allowed in [IETF RFC 2732]. Disallowed characters are
>  escaped as follows: [...]
>That says that square brackets are not in the set of disallowed
>characters, regardless of what 2732 itself says.
>Similarly, XML 1.0 http://www.w3.org/TR/REC-xml/#sec-external-ent says:
>  The characters to be escaped are the control characters #x0 to #x1F
>  and #x7F (most of which cannot appear in XML), space #x20, the
>  delimiters '<' #x3C, '>' #x3E and '"' #x22, the unwise characters '{'
>  #x7B, '}' #x7D, '|' #x7C, '\' #x5C, '^' #x5E and '`' #x60, as well as
>  all characters above #x7F.
>and square brackets are not in that list.  Even if 2732 is ambiguous,
>these specs are not.
>-- Richard

#-#-#  Martin J. Du"rst, Assoc. Professor, Aoyama Gakuin University
#-#-#  http://www.sw.it.aoyama.ac.jp       mailto:duerst@it.aoyama.ac.jp     
Received on Tuesday, 6 November 2007 09:42:37 UTC

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