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Re: Filter Templates

From: Cameron McCormack <cam@mcc.id.au>
Date: Wed, 12 Jan 2011 09:35:53 +1300
To: Brad Kemper <brad.kemper@gmail.com>, www-style list <www-style@w3.org>, public-fx@w3.org
Message-ID: <20110111203553.GB4160@wok.mcc.id.au>
Cameron McCormack:
> I think we need to carefully think about what parameters the filters
> are allowed to expose; we obviously don’t want this to turn into a
> general templating solution.

Having said that, it might be worth looking at all of the SVG definition-
like elements to see whether they would fit well with a simple value
parameterisation like this, or whether SVG Parameters would solve this
problem.

My concern about parameterised content is that it stays simple enough
that implementations don’t need to basically clone the whole subtree for
every different instantiation, resulting in high memory usage.  I think
this is why the SVG <use> element has had slow adoption: its content is
parametric in all of its inherited style, and the simple implementation
is one that clones the subtree and keeps it in sync with the original.
Part of the reason for <use>’s existince was to allow symbols to be
drawn without their DOMs being duplicated for each instance, but its
implementation complexity holds this back.  If our parameterisation works
only on a very focussed set of values, then that could help implementors
avoid the naive solution.

-- 
Cameron McCormack ≝ http://mcc.id.au/
Received on Tuesday, 11 January 2011 20:38:04 GMT

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