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Re: Ambiguities in fill:url() / stroke:url() syntax

From: Dirk Schulze <dschulze@adobe.com>
Date: Sat, 27 Oct 2012 08:41:01 -0700
To: "robert@ocallahan.org" <robert@ocallahan.org>
CC: www-svg <www-svg@w3.org>, www-style <www-style@w3.org>
Message-ID: <EDB202C2-D48C-4B45-9294-DDF237285A9F@adobe.com>

On Oct 27, 2012, at 12:26 PM, Robert O'Callahan <robert@ocallahan.org> wrote:

> Here's an alternative proposal:
> 
> Given a url() value in a context whether either an external resource reference (e.g. paint server reference) or an image load (e.g. SVG image) could be performed, 
> a) If the resolved URI uses a Media Fragments URI feature, or the svgView feature (http://www.w3.org/TR/SVG/linking.html#LinksIntoSVG), perform an image load.
> b) otherwise, if the resolved URI includes a fragment identifier, perform an external resource reference.
> c) otherwise, perform an image load.
> URIs in image() values always perform an image load. URIs in element() values always perform an external resource reference.
> 
> I think this proposal almost always does what the author wants, and is compatible with almost all existing usage, while being very simple. The only problematic case is that url(foobar.svg#abc) can no longer be used to link to a specific element in an SVG file; image(foobar.svg#abc) must be used instead. I think the usage of that feature is currently very low and can probably be broken, at least if we do it soon.
> 
> Some fine-tuning of this proposal could be done. For example we might modify step a) to treat any URI with a fragment identifier containing certain characters (e.g. '=', '(', ')') as an image load, so that Media Fragments-like features can be introduced later without potentially changing behavior.
If we should introduce the image() function, I don't necessarily see a reason for option a) and c). They might confuse people when they don't need to use image() but when they really do. Just URL may always mean paint server reference. But don't have strong feelings.

Beside URL and image() we would have linear-gradient(), radial-gradient() and so on, right?

Greetings,
Dirk


> 
> Rob
> -- 
> “You have heard that it was said, ‘Love your neighbor and hate your enemy.’ But I tell you, love your enemies and pray for those who persecute you, that you may be children of your Father in heaven. ... If you love those who love you, what reward will you get? Are not even the tax collectors doing that? And if you greet only your own people, what are you doing more than others?" [Matthew 5:43-47]
> 
Received on Saturday, 27 October 2012 15:41:34 GMT

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