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Re: A few comments on SpecGL -- part 4

From: Lofton Henderson <lofton@rockynet.com>
Date: Thu, 01 Aug 2002 18:43:13 -0600
Message-Id: <5.1.0.14.2.20020801153615.02c4ed50@rockynet.com>
To: David Marston/Cambridge/IBM <david_marston@us.ibm.com>, www-qa-wg@w3.org

All --

About levels...

At 05:27 PM 7/30/02 -0400, David Marston/Cambridge/IBM wrote:
>[...]
>
>Ck 5.1: Use of profiles and levels together is tricky. I think that the
>profiles drive the spec,

I agree.

>and you could have a Level 1 for each profile,
>just as you could for each module.

I have an example of a standard with 4 levels (historical fallout), and 
several associated profiles.  In the "A" profile, you can have content 
instances that are self-identified as A-1, A-2, A-3, A-4, but these are not 
all recognized conformance categories.  The conformance specifications 
recognize A-3 and A-4.  I.e., UA support for A-1 or A-2 alone is not 
conforming.

All of the examples of functional levels that I can think of are a 
consequence of progressive historical enrichment of a standard.

CSS 1, 2, 3
DOM 1, 2, 3
(ISO) CGM 1, 2, 3, 4

Does anyone have a good example of functional levels as a deliberate 
functional design, e.g., that could subdivide a modularization?  People 
have postulated things like low-precision/high-precision levels, etc.  Can 
someone point to a W3C (or otherwise) example?

In SVG conformance, there is a notion of normal-quality versus 
high-quality.  The latter subsumes all of the former, and adds additional 
requirements.  It tempts one to think "levels", but is not called 
that.  Because there is also the concept of static-rendering versus dynamic 
(again the latter subsumes the former).  The two concepts combine combine, 
a 2x2 cross product, yielding 4 conformance defined categories: 
normal-static, highQuality-static, normal-dynamic, 
highQuality-dynamic.  Not levels here.

So ... examples?

-Lofton.
Received on Thursday, 1 August 2002 20:40:15 GMT

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