Mike - I am not sure but my gut feeling is that it would start with the most restrictive one first.  i.e  If empty string    ( assuming it has length facet 1) -  would match Nothing ,   then xsd:token which is restricted form of xs:string.  I think you are going to get string with white spaces collpsed  ( xsd:token) if it not empty string.  You can run few tests to see the behavior..


Suman Kalia
IBM Canada Lab
WMB Toolkit Architect and Development Lead
Tel: 905-413-3923 T/L 313-3923
Email: kalia@ca.ibm.com

For info on Message broker
http://www.ibm.com/developerworks/websphere/zones/businessintegration/wmb.html





From:        Mike Beckerle <mbeckerle.dfdl@gmail.com>
To:        dfdl-wg@ogf.org,
Date:        03/19/2013 12:43 PM
Subject:        [DFDL-WG] whitespace in DFDL annotations: right now regex is xs:string, expression is xs:token
Sent by:        dfdl-wg-bounces@ogf.org

---

This came up on the call. The schemas I have for DFDL annotations have DFDLRegularExpression as an xs:string, and DFDLExpression as an xs:token. I have no clue what a union of these types behaves like. But we have a union called DFDLExpressionOrPatternOrNothing which is a 3-way union of DFDLExpression, DFDLRegularExpression, and EmptyString (which is also derived from xs:string but has length facet of 0 as well.


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Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com
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