CVA scope creep?

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

Hi folks,

With the advent coming of W3C Schema 1.1, there is an opportunity to 
add to the scope of context/value association (CVA) files ... but I'm 
worried about scope creep.

Right now a CVA file is only associated contexts with code list values.

It would be easy to add to CVA files the association of contexts with 
arbitrary values expressed in XPath.  Such values could be 
requirements such as qualifying data types ... for example by 
imposing a string length:

    string-length(.) = 35

In a W3C Schema 1.1 implementation of CVA file this would translate 
into a combination of enumerations, facets and assertions.  It would 
mean being able to express all of the requirements in one file rather 
than a combination of files.

Similarly, in a Schematron implementation of CVA file this would 
allow one to express all of the requirements in one file rather than 
a combination of files.

I've completed the prototyping and it meshes well with the current 
design.  But I'm at the stage where I can easily unwind my changes if 
you think this is a non-starter.  I don't want to waste more of my 
time on it if the committee feels strongly it is out of scope.

Managing all of one's context/value associations in a single 
declarative fashion sounds attractive to me, but do you believe going 
beyond the association of code lists going beyond our scope?  Do you 
need to see a more polished prototype before offering an opinion?

Thanks for your thoughts on this!  If I don't hear any disagreements, 
I'll prepare the next draft for committee review.  If Tony gets his 
genericode change proposals posted soon, then we an cover off both in 
our first return call (not yet scheduled).

. . . . . . . . . . Ken

p.s. please let me know if anyone doesn't have Skype with which to 
participate in committee conference calls.  In the UBL committee 
we've been having a lot of success in conference calls and for remote 
participation in our face-to-face plenary using http://www.yugma.com 
for desktop broadcast.  The Skype Edition is a free download and 
install (third column on home page) and need only be downloaded by 
those who are sharing their screen with others ... if you plan only 
to view someone else's screen, there is nothing to download in 
advance.  You just sign into a web page without downloading anything 
and you get to view the host's screen.

--
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G. Ken Holman                 mailto:gkholman@CraneSoftwrights.com
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