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Re: Instances, Models and <bind>

From: Mark Seaborne <mseaborne@origoservices.com>
Date: Wed, 07 Apr 2004 10:12:12 +0100
To: "Robert Bateman" <bobbateman@sequoiallc.com>, <www-forms@w3.org>
Message-ID: <BC99847C.3F17%mseaborne@origoservices.com>


You cannot refer to an instance in A model in a bind in B model. The only
feature of XForms that allows you to combine instances from different models
in any way is select/select1 and itemset.

The argument goes that if you want to combine models, you should author
model fragments and pull them together into one model using XInclude.
All the best



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> From: "Robert Bateman" <bobbateman@sequoiallc.com>
> Date: Fri, 2 Apr 2004 13:17:00 -0500
> To: <www-forms@w3.org>
> Subject: Instances, Models and <bind>
> Resent-From: www-forms@w3.org
> Resent-Date: Fri,  2 Apr 2004 13:18:08 -0500 (EST)
> In looking at a bunch of examples from around the web, I've noticed people
> seem to have implemented the 1 instance per model method in their forms.
> Not being all that comfortable - yet - with Xforms, my "test" form has 3
> instances inside of one model.  Seeing how crowded this has made my form, I'm
> attempting to break things up a bit.  But I've run into a bit of a
> confusion...
> I have 3 instances:  xmlData, scratchPad and guiData.  xmlData will,
> eventually, be sent off to the server for processing.  But some fields in
> xmlData require lists and other selectable data that is stored (and
> referenced) from the scratchPad instance.  And some fields, especially the
> ones that are "optional" are stored in the guiData instance with xmlData
> using <relevant> to control inclusion of the specific data.
> Now to the "problem".  If I put the guiData instance into a seperate model I
> start to get syntax errors in my form.  So I have to assume my <input>,
> <output>, etc. items need to have @model specified.  So far so good.
> But as I look at my <bind> definitions, I find many of the binds reference
> datum in other models.  Does it matter in Xforms if I have a <bind> in one
> model that references instance data in a different model?
> Bob
Received on Wednesday, 7 April 2004 05:12:43 UTC

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