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 -- dfdl-wg mailing list dfdl-wg@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