[DFDL-WG] New Experimental Feature document: dfdl:emptyElementParsePolcy

[Steve Hanson]

Mike

The new document looks good, the descriptions of the property values are 
clear and simple.

One comment of yours I need to follow up though. You said:

" Bug in this doc. Daffodil is not inserting defaults here (doesn’t 
implement default insertion when parsing.)  Fixed with new language you 
suggested. "

Are you saying that if Daffodil parses an occurrence and determines it has 
the empty rep, and there is a default value on the element declaration, 
that the default value is not used?  If so then what happens?  Further, if 
you subsequently change Daffodil so it does use the default value, you 
have silently changed parsing behaviour in an incompatible way. IBM DFDL 
similarly does not use default values when parsing, but to prevent a 
future incompatible behaviour change, if we find a zero-length occurrence 
and there is a default value, we throw a runtime SDE. 

Regards
 
Steve Hanson
IBM Hybrid Integration, Hursley, UK
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
smh at uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890
Note: I work Tuesday to Friday 



From:   Mike Beckerle <mbeckerle.dfdl at gmail.com>
To:     Steve Hanson <smh at uk.ibm.com>
Cc:     DFDL-WG <dfdl-wg at ogf.org>
Date:   16/10/2019 19:19
Subject:        [EXTERNAL] Re: [DFDL-WG] New Experimental Feature 
document: dfdl:emptyElementParsePolcy




I have revised this per your comments, and uploaded a new revision. Link: 
https://redmine.ogf.org/dmsf_files/13596?download=


Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com
Please note: Contributions to the DFDL Workgroup's email discussions are 
subject to the OGF Intellectual Property Policy



On Wed, Oct 16, 2019 at 12:23 PM Steve Hanson <smh at uk.ibm.com> wrote:
Mike 

Some significant comments on this. 



Regards
 
Steve Hanson 
IBM Hybrid Integration, Hursley, UK
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
smh at uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890
Note: I work Tuesday to Friday 



From:        Mike Beckerle <mbeckerle.dfdl at gmail.com> 
To:        DFDL-WG <dfdl-wg at ogf.org> 
Date:        14/10/2019 19:58 
Subject:        [EXTERNAL] [DFDL-WG] New Experimental Feature document:   
     dfdl:emptyElementParsePolcy 
Sent by:        "dfdl-wg" <dfdl-wg-bounces at ogf.org> 



Per one of our trackers I uploaded an "official" document to describe this 
experimental feature. 

gwde-dfdl-experience-7-emptyElementParsePolicy.docx 

This describes the feature as we have implemented it in Daffodil. There 
has been some discussion on this proposal already, particularly on whether 
the enum values for the property are appropriately chosen so that they 
clearly identify the different behaviors. 

Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com 
Please note: Contributions to the DFDL Workgroup's email discussions are 
subject to the OGF Intellectual Property Policy 
--
 dfdl-wg mailing list
 dfdl-wg at ogf.org
 https://www.ogf.org/mailman/listinfo/dfdl-wg 

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

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.ogf.org/pipermail/dfdl-wg/attachments/20191122/26721917/attachment.html>