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

[Benoit Bezaire <benoit@itedo.com>]

Hi Lofton,

That helps, thanks! We don't have the space-separated lists of URIs,
so the wrinkle doesn't affect us (right?).

-- 
 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