[DFDL-WG] dfdl:outputValueCalc referencing itself

[Suman Kalia]

Mike -  I am not sure what would be the technical problem allowing 
outputValueCalc on the element to reference itself. 

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

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From:   Mike Beckerle <mbeckerle.dfdl at gmail.com>
To:     Steve Hanson <smh at uk.ibm.com>, 
Cc:     dfdl-wg at ogf.org
Date:   06/26/2013 12:25 PM
Subject:        Re: [DFDL-WG] dfdl:outputValueCalc referencing itself
Sent by:        dfdl-wg-bounces at ogf.org



You should use two elements for this, and hide the original one.

I think the non-circularity requirement is pretty important actually.

Note that you can refer to the same element of some other say, array
instance, i.e.,

<element name="foo" .... dfdl:inputValueCalc="{ fn:concat(if (pos() ==
1) then "" else ../foo[pos() - 1] , .) }" />



On Wed, Jun 26, 2013 at 11:28 AM, Steve Hanson <smh at uk.ibm.com> wrote:
> The spec currently says that the expression in dfdl:outputValueCalc must 
not
> refer to itself.  I am wondering if that is too restrictive. For 
example,
> what if I wanted to apply a simple transformation to the data before it 
is
> serialized, example:
>
> <xs:element name="f1" type="xs:string"
> dfdl:outputValueCalc="{fn:upper-case(.)}" />
>
> 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
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with number
> 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 
3AU
>
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-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com
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