[DFDL-WG] Spec: Leading skip applied to every repeat of a repeating element [s]

[Mike Beckerle]

I would assume that the skip properties are not array-oriented, as they
don't have "occurs" in their name. Hence, they apply to each element
instance in the same way as lengthKind and encoding and other non "occurs"
properties.

....mike

On Tue, Oct 16, 2012 at 4:12 AM, Steve Hanson <smh at uk.ibm.com> wrote:

> Need confirmation from the DFDL WG as to the purpose of the leadingSkip
> property. The grammar says that leadingSkip applies to all occurrences of
> an array element.  Suman has indicated (below) that his intent for the
> property was to apply to the array as a whole.  The DFDL approach for
> 'array as a whole' properties is to carry them on a wrapper sequence, not
> the element itself.
>
> Regards
>
> Steve Hanson
> Architect, Data Format Description Language (DFDL)
> Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
> IBM SWG, Hursley, UK*
> **smh at uk.ibm.com* <smh at uk.ibm.com>
> tel:+44-1962-815848
> ----- Forwarded by Steve Hanson/UK/IBM on 16/10/2012 09:02 -----
>
> From:        Suman Kalia/Toronto/IBM at IBMCA
> To:        Steve Hanson/UK/IBM at IBMGB
> Cc:        Alex Wood1/UK/IBM at IBMGB
> Date:        15/10/2012 22:58
> Subject:        Re: [Work Item 9791] Spec: Leading skip applied to every
> repeat of a repeating element [s]
> ------------------------------
>
>
> I intended the behavior of leading and trailing skip counts for repeats to
> be same as in  MRM.    I can't say for sure if this would break anything in
> PL/1 as we have not implemented but certainly this behavior is required for
> COBOL..  We can discuss this in workgroup and if everyone agrees add it to
>  Errata..
>
> 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
>
> For info on Message broker
>
> http://www.ibm.com/developerworks/websphere/zones/businessintegration/wmb.html
>
>
>
>
>
> From:        Steve Hanson/UK/IBM at IBMGB
> To:        Suman Kalia/Toronto/IBM at IBMCA,
> Cc:        Alex Wood1/UK/IBM at IBMGB
> Date:        10/15/2012 01:24 PM
> Subject:        Re: [Work Item 9791] Spec: Leading skip applied to every
> repeat of a repeating element [s]
> ------------------------------
>
>
> Does that mean in MRM that we have asymmetric behaviour between
> leadingSkip and trailingSkip ?  I'm reading that for MRM leading skip was
> just for first element, but trailing skip is for every repeat.  That's not
> how the DFDL grammar says things work - it applies leading skip to every
> repeat.
>
> Regards
>
> Steve Hanson
> Architect, Data Format Description Language (DFDL)
> Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
> IBM SWG, Hursley, UK*
> **smh at uk.ibm.com* <smh at uk.ibm.com>
> tel:+44-1962-815848
>
>
>
>
> From:        Suman Kalia/Toronto/IBM at IBMCA
> To:        Steve Hanson/UK/IBM at IBMGB
> Date:        15/10/2012 15:18
> Subject:        Re: [Work Item 9791] Spec: Leading skip applied to every
> repeat of a repeating element [s]
> ------------------------------
>
>
> I am travelling and offsite and cannot access the RTC..
>
> Yes trailing skip count get applied to every repeating element.. this is
> the same semantic we have in MRM.. In COBOL terms , these are slack bytes
> which are added at the end of the structure if required.
>
> 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
>
> For info on Message broker
>
> http://www.ibm.com/developerworks/websphere/zones/businessintegration/wmb.html
>
>
>
>
> 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
>
> --
>   dfdl-wg mailing list
>   dfdl-wg at ogf.org
>   https://www.ogf.org/mailman/listinfo/dfdl-wg
>



-- 
Mike Beckerle | OGF DFDL WG Co-Chair
Tel:  781-330-0412
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.ogf.org/pipermail/dfdl-wg/attachments/20121016/c336f7b9/attachment.html>