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Subject: Re[8]: [cgmo-webcgm] implications of URI vs. IRI


At 10:40 AM 10/12/2005 -0400, Benoit Bezaire wrote:
>Hi Lofton,
>
>That helps, thanks! We don't have the space-separated lists of URIs,
>so the wrinkle doesn't affect us (right?).

Right.

The wrinkle we need to worry about is that 3-char strings %hh, that might 
look like *escaped* URI character data, are valid ApsAttr 'name'  data.

More about that in my next message.

-Lofton.


>--
>  Benoit   mailto:benoit@itedo.com
>
>
>Wednesday, October 12, 2005, 10:15:33 AM, Lofton wrote:
>
>LH> Further information on the issue, here is a dialog with Chris, where I
>LH> asked for clarification on the intent of the text in SVG.  "Both forms
>LH> allowed" is correct (with one small wrinkle about BLANK.)
>
> >>At 12:04 PM 10/12/2005 +0200, Chris Lilley wrote:
> >>On Wednesday, October 12, 2005, 2:09:42 AM, Lofton wrote:
> >>
> >>LH> Hi Chris,
> >>
> >>LH> I'm interested in the intent behind this statement from SVG11, section
> >>LH> 5.3.2, "URI reference attributes", and perhaps your memory of those ol'
> >>LH> days has the answer:
> >>
> >>It was a half way house to IRIs. Well, more than half way, in fact. In
> >>SVG 1.2 that language is replaced by a reference to IRI.
> >>
> >> >>"The value of the href attribute must be a URI reference as defined in
> >> >>[RFC2396], or must result in a URI reference after the escaping 
> procedure
> >> >>described below is applied. The procedure is applied when passing 
> the URI
> >> >>reference to a URI resolver."
> >>
> >>LH> I read that as specifying either of these as acceptable in SVG content:
> >>
> >>LH> <image href="raster%20reference%20image.png" .../>
> >>LH> <image href="raster reference image.png" .../>
> >>
> >>Unfortunately the space character is special (some attributes take
> >>space-separated lists of URIs or IRIs) and always needs to be escaped,
> >>per IRI. Pretty much any other character not allowed in URIs would have
> >>fitted into that example.
> >>
> >>LH> I.e., either the post-uri-encoded form (which is a 
> rfc2396-compliant URI
> >>LH> reference), or the pre-uri-encoded form, which is not yet a
> >>LH> rfc2396-compliant URI reference,  may appear in SVG content.  Correct?
> >>
> >>Yes.
> >>
> >>LH> -Lofton.
> >>
> >>LH> [1] http://www.w3.org/TR/SVG11/struct.html#xlinkRefAttrs
> >>LH> [2] http://www.ietf.org/rfc/rfc3986.txt




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