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Re: Odd syntax? xsl-fo 1.1

From: G. Ken Holman <gkholman@CraneSoftwrights.com>
Date: Fri, 07 Jan 2011 10:38:59 -0500
Message-Id: <>
To: www-xsl-fo@w3.org
At 2011-01-07 15:23 +0000, Dave Pawson wrote:
>7.17.4 "text-decoration"
>CSS2 Definition:
>Value:  none | [ [ underline | no-underline] || [ overline |
>no-overline ] || [ line-through | no-line-through ] || [ blink |
>no-blink ] ] | inherit
>When converted (laboriously) to a schema definition...
>It is long.
>It is (to me) largely incomprehensible.

That it is comprehensible by a schema processor is sufficient.  That 
something that is required is awkward for the developer is irrelevant.

>I asked and received help from
>the rng list.
>There are a few examples of this...
>I wonder
>a) if xsd 1.1 can cope any better

Schematron assertion augmentations might be best I think, though I 
haven't taken the time to draw it out.

>b) this complexity is needed.

It isn't complex.  To the user it is incredibly simple.  A set of 
four mutually-exclusive pairs of values, or if not, one of two other values.

>c) If it is needed, could it be simplified in some way

Simplicity should be from the perspective of the user.  We 
programmers have to take on the mantle of difficulty to make things 
easy for the user.  I think making any decision to "simplify" 
anything for technical reasons has to have zero impact on how the 
user sees the issue.  If it impacts on how the user sees the issue, 
it should be a non-starter.

We are here to serve our users.

If you technically simply that definition for the attribute, you will 
change what it means to the user ... for example, if the technical 
simplification allows, simultaneously, "none overline", the user is 
poorly served by being allowed to enter something nonsensical.

The syntax is correct to meet the need, not "odd" ... the 
implementation may need to be awkward to the developer to express 
what the user needs.

I hope this helps.

. . . . . . . . . . . . Ken

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Received on Friday, 7 January 2011 15:40:00 UTC

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