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RE: Switch and Feature Strings

From: Doug Schepers <doug@schepers.cc>
Date: Wed, 28 Sep 2005 02:31:10 -0400
To: "'Chris Lilley'" <chris@w3.org>, "'www-svg'" <www-svg@w3.org>
Message-Id: <20050928063119.8FA6712DA05@pilfer.dreamhost.com>

Hi, Chris-

I'm going to reply a bit out of order here.

| You mean a specific test attribute, or a specific element?

I mean a specific element.
The requiredFeatures attribute [1] says "Only feature strings defined in the
Feature String appendix are allowed." According to Appendix O: Feature
Strings [2], there is a Feature String for the Basic Text Module [3], or the
entire Text Module [4], but not individual elements within that module, such
as 'textPath', or 'tref', or 'tspan'. 

So, is it not possible to test for features at the level of the element,
rather than at the level of the module?

| DS> Well, this sample doesn't work, but I don't know if I'm 
| simply doing 
| DS> something wrong:
| It looks correct to me. You can test if requiredFeatures is itself
| implemented:
| <switch>
|    <text 
| requiredFeatures='http://www.w3.org/TR/SVG11/feature#textPath'
|  x="100" y="100">Yes!</text>
|    <text  x="100" y="100">No :(</text>
| </switch>

I've been testing in FF1.5 (since ASV3 only implements the requiredFeatures
strings from SVG1.0, not the revised strings from SVG1.1). FF1.5 does
implement 'switch' and 'requiredFeatures', although it incorrectly reports
that it implements the full Text Module, rather than only the BasicText
Module. I've filed a bug with them [5].

But I can't currently use 'switch' to test for 'textPath' and fall back to a
simpler logo, which is what I'd hoped to do.

[2] http://www.w3.org/TR/SVG/feature.html
[3] http://www.w3.org/TR/SVG11/feature#BasicText
[4] http://www.w3.org/TR/SVG11/feature#Text
[5] https://bugzilla.mozilla.org/show_bug.cgi?id=310270 (see test below)


doug . schepers  @ vectoreal.com
www.vectoreal.com ...for scalable solutions.

<svg xmlns='http://www.w3.org/2000/svg'

   <title>'switch' Test: 1.0 vs. 1.1</title>

      <text requiredFeatures='org.w3c.svg.static' x='100' y='100'>1.0,
Static: Yes</text>
      <text  x='100' y='100'>1.0, Static: No</text>

      <text requiredFeatures='org.w3c.svg.animation' x='100' y='130'>1.0,
Animation: Yes</text>
      <text  x='100' y='130'>1.0, Animation: No</text>

      <text requiredFeatures='http://www.w3.org/TR/SVG11/feature#Shape'
x='250' y='100'>1.1, Static: Yes</text>
      <text  x='250' y='100'>1.1, Static: No</text>

      <text requiredFeatures='http://www.w3.org/TR/SVG11/feature#Animation'
x='250' y='130'>1.1, Animation: Yes</text>
      <text  x='250' y='130'>1.1, Animation: No</text>

      <text requiredFeatures='http://www.w3.org/TR/SVG11/feature#Text'
x='250' y='160'>1.1, Text: Yes</text>
      <text  x='250' y='160'>1.1, Text: No</text>

      <text requiredFeatures='http://www.w3.org/TR/SVG11/feature#BasicText'
x='250' y='190'>1.1, BasicText: Yes</text>
      <text  x='250' y='190'>1.1, BasicText: No</text>

      <text requiredFeatures='http://www.w3.org/TR/SVG11/feature#textPath'
x='250' y='220'>1.1, textPath: Yes</text>
      <text  x='250' y='220'>1.1, textPath: No</text>

Received on Wednesday, 28 September 2005 06:31:35 UTC

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