[DFDL-WG] Errata 3.1 issue: hiddenGroupRef allowed (or not) on xs:choice

[Steve Hanson]

Mike

Looking back, the paragraph that mentions choices was added in errata v002 
as a result of a discussion in DFDL WG call on 16th August 2011:

17, 14.5. We decided recently that inputValueCalc, outputValueCalc and 
hiddenGroupRef could not be put in 
 scope via dfdl:ref. But presumably it is still possible for an element 
reference or group reference to use 
 these properties?  Clarify whether these properties may be set on local 
object, global object and/or
 reference to global.
 InputValueCalc and OutputValueCalc: Allowed on local element and element 
ref but not on global element. 
 HiddenGroupRef: Allowed on any xs:sequence or xs:choice but not on any 
xs:group, including ref. 

I can not recall changing the rule to allow dfdl:hiddenGroupRef on a 
choice, I suspect this is a mistake on my part when writing the minutes, 
and is possibly me getting confused with the allowable content of the 
hidden group itself, which may be a sequence or a choice.

We should correct the errata to say:

The spec is not clear as to whether this property is allowed on the 
sequences and choices that are the direct children of global groups, or on 
group references.  Clarify that it is allowed on any xs:sequence or 
xs:choice but not on any xs:group, including group reference.

Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848



From:   Mike Beckerle <mbeckerle.dfdl at gmail.com>
To:     dfdl-wg at ogf.org, 
Date:   10/08/2013 19:01
Subject:        [DFDL-WG] Errata 3.1 issue: hiddenGroupRef allowed (or 
not) on xs:choice
Sent by:        dfdl-wg-bounces at ogf.org




The language of Erratum 3.1 state that the dfdl:hiddenGroupRef property 
should be allowed on xs:choice schema components.

This is a major language change that we should consider carefully. 
Previously it was allowed only on xs:sequence, and I believe that should 
be the only allowed usage.

Can we review when we made the decision to broaden this to xs:choice as 
well?

...mikeb

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