Allow multiple Model Item Property definitions

Original post from StevenPemberton:

Date: Fri, 08 Jun 2007 11:50:43 +0200
To: "www-forms-editor@w3.org" <www-forms-editor@w3.org>
Subject: 6.1 Model Item Property Definitions
From: "Steven Pemberton" <Steven.Pemberton@cwi.nl>

http://www.w3.org/TR/xforms11/#model-xformsconstraints

"It is an error to attempt to set a model item property twice on the same
node."

I thought we had agreed to relax this. I remember discussing it for
constraints, but as long as MIPs don't confliuct, is it a problem?

Steven

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