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Re: Decouple XBL2 From CSS

From: Ian Hickson <ian@hixie.ch>
Date: Wed, 2 Aug 2006 22:24:51 +0000 (UTC)
To: Doug Schepers <doug.schepers@vectoreal.com>
Cc: public-appformats@w3.org
Message-ID: <Pine.LNX.4.62.0608022210020.5340@dhalsim.dreamhost.com>

On Wed, 2 Aug 2006, Doug Schepers wrote:
> The XBL2 spec, as it stands, assumes only CSS for binding and for 
> styling. This is an unnecessarily narrow requirement.  There should be 
> options for other standardized languages as appropriate, such as XSL:FO 
> for styling and XBL for binding.

I don't understand how XBL assumes anything for styling. It's a binding 
language, not a styling language. It already supports XSL:FO, both in 
terms of being used from XSL, and in terms of including XSL in bindings.

> Please revise the specification so that it does not assume that CSS is 
> integral to XBL2.

CSS isn't integral to XBL2, though of course XBL2 is designed to integrate 
tightly with XBL2.

However, even if it was, that doesn't seme like a problem. XBL2 is 
intended to be a language used on the Web, primarily in Web browsers. The 
Web is based on HTML, CSS, and JavaScript, so XBL should work tightly 
with those languages. XSL:FO is never used on the Web, so seems mostly 
irrelevant in terms of XBL.

Pragmatism is important; we don't want to run the risk of 
over-generalising the specification, or making it too extensible, to the 
point where authors don't have a clear picture of how to use the 
technology, or to the point where the technology doesn't fit well with 
their existing content and existing skill set.

That's not to say that we should prevent interaction with other 
technologies; for example XBL is compatible with XML ID, XLink, XInclude, 
XML Schema, and a host of other technologies which could hypothetically be 
used on the Web. But it does mean we shouldn't design the specification to 
assume those technologies will be available.

I hope this helps explain the design principles behind XBL2.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Wednesday, 2 August 2006 22:25:14 UTC

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