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Re: [SVGMobile12] SVGT12-207: Support for transformations is optional?

From: Jon Ferraiolo <jonf@adobe.com>
Date: Tue, 9 May 2006 16:11:15 -0700
Message-ID: <6ECA24BE410D994496A2AE995367C5C8AED908@namail3.corp.adobe.com>
To: "Ian Hickson" <ian@hixie.ch>
Cc: <www-svg@w3.org>

Ian,
This is the official response from the SVG WG to your Last Call comment
at the following URL:
  http://lists.w3.org/Archives/Public/www-svg/2005Dec/0257.html

We agree that some of the language in the sections of the coordinates
system chapter that you list below could be improved and have made some
minor editorial changes, some of which are described in SVG WG responses
to other emails from you. However, we do not agree that we need to make
all of the changes you suggest in the email below. For example, you
imply that the specification is unclear that UAs must implement
transforms because you could not find the word "must" within the
sections on tranforms; however, we believe that it is self-evident to
implementers that their implementations must supports SVG's transform
features in order to be compliant even if the word "must" does not
appear in those sections. In fact, we are not aware of implementations
that have failed to support transformations due to the lack of the word
"must" within those sections of the specification.

Other email from you criticizes loose wording in the sections of viewBox
and preserveAspectRatio. We have made minor editorial fixes to those
sections. These are described in other email you should receive shortly.

Thank you very much for your thorough review and excellent feedback.
Please tell us within two weeks if you are not satisfied with this
response.

Jon Ferraiolo
SVG WG

--------------

From: Ian Hickson <ian@hixie.ch> 
Date: Wed, 28 Dec 2005 16:33:46 +0000 (UTC)
To: www-svg@w3.org 
Message-ID: <Pine.LNX.4.62.0512281625040.7669@dhalsim.dreamhost.com> 


There do not appear to be _any_ conformance requirements at all in the 
following sections:

 7.4 Coordinate system transformations
 7.5 Nested transformations
 7.6 The transform attribute
 7.6.1 The TransformList value
 7.7 Constrained Transformations
 7.7.1 The User Transform
 7.7.2 ViewBox to Viewport transformation
 7.7.3 Element Transform Stack
 7.7.4 The Current Transform Matrix
 7.7.5 The ref() transform value

In fact, in the entire document, the only attempt at normative 
requirements regarding transforms that I could find was in the dubious 
definition of the 'vector-effect' property. The sections cited above
thus 
describe many things that do not in fact appear to be required of any 
implementations. These descriptions therefore seem incorrect.

Please update the specification so that it is clear what UAs must do in 
terms of implementing the transform="" and viewBox="" attributes, as
well 
as any other transformation-related behaviour. Please then update the 
sections above so that they only describe the behaviour of conformant
user 
agents, and do not make assertions that are not based in actual 
conformance requirements.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Tuesday, 9 May 2006 23:11:28 GMT

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