W3C home > Mailing lists > Public > www-forms@w3.org > August 2006

Re: send can violate bind/@constraint

From: Aaron Reed <aaronr@us.ibm.com>
Date: Fri, 11 Aug 2006 18:08:08 -0500
To: www-forms@w3.org
Message-ID: <ebj2lc$sdu$1@sea.gmane.org>


> I recently encountered two different XForms processors that do this.
> While I think the behavior is incorrect, it may be that it is emergent
> from the events described in the spec.
> 
> Leigh.

As I work on a processor that does not catch the constaint violation 
that Leigh mentions, I can give you my interpretation of the spec.  In 
xforms-recalculate 
(http://www.w3.org/TR/xforms/index-all.html#evt-recalculate), it 
mentions that this is where the model item property evaluations occur. 
I see not other place in the spec that mentions MIP evaluation.  When 
xforms-recalculate happens, we store the resulting node states in the 
MDG.  This is what we reference when a submission request occurs.

In Leigh's example, during the xf:action, a xf:setvalue happens. 
However, all of our remembered constraint, relevancy, etc. nodestates 
are for the previous node value until recalculate happens.  Since 
recalculation is deferred in Leigh's example, this won't happen until 
after the xf:send happens.

I believe that we are working in accordance to the spec.  If we are not, 
please let us know which MIP evaluations should happen that we are 
missing and when they should happen.  I can kindof see in the spec where 
  possibly relevancy and constraint should be evaluated during 
submission, but that also doesn't make sense to me since I definitely 
don't see where @calculate would be processed and constraint could 
easily be dependent on the result from an @calculate which didn't run.

Have a great weekend all,
--Aaron
Received on Friday, 11 August 2006 23:10:35 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Saturday, 10 March 2012 06:22:06 GMT