OK so that sounds fine.
Similar concern for unparsing though.
What happens today if I omit a required occurrence from the infoset, but
there is a default value on the element declaration? Hopefully you give
an error rather than just continuing.
Regards
Steve Hanson
IBM Hybrid Integration, Hursley, UK
Architect, IBM
DFDL
Co-Chair, OGF
DFDL Working Group
smh@uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890
Note: I work Tuesday to Friday
From:
Mike Beckerle <mbeckerle.dfdl@gmail.com>
To:
Steve Hanson <smh@uk.ibm.com>
Cc:
DFDL-WG <dfdl-wg@ogf.org>
Date:
22/11/2019 19:43
Subject:
[EXTERNAL] Re:
[DFDL-WG] New Experimental Feature document: dfdl:emptyElementParsePolcy
Actually daffodil doesn't insert defaults when parsing,
it creates the element, having no value, and then on-demand, when accessed,
the value is pulled from where we save it in the static runtime data structures,
and is saved as the element's value. This can happen when an expression
refers to the element, or when the data set is subsequently output as some
other representation like JSON or XML.
So we *are* somehow doing defaults when parsing. Just
not at the time the parser traverses the element. For all intents
and purposes we are doing defaulting during parsing. Not unparsing yet
though.
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 Fri, Nov 22, 2019 at 11:57 AM Steve Hanson <smh@uk.ibm.com>
wrote:
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@uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890
Note: I work Tuesday to Friday
From: Mike
Beckerle <mbeckerle.dfdl@gmail.com>
To: Steve
Hanson <smh@uk.ibm.com>
Cc: DFDL-WG
<dfdl-wg@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@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@uk.ibm.com
tel:+44-1962-815848
mob:+44-7717-378890
Note: I work Tuesday to Friday
From: Mike
Beckerle <mbeckerle.dfdl@gmail.com>
To: DFDL-WG
<dfdl-wg@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@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
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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