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October 2025

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DFDL working rev 1.2.0 - ISO Formatted but still "OGF content" version of Spec
by Mike Beckerle 02 Oct '25

02 Oct '25

This took a few hours, but worked. See: https://github.com/OpenGridForum/DFDL/blob/master/docs/draft-gwdrp-dfdl-v1.… There are also PDF and HTML versions of the same in the same folder. There's hidden text in the MS-Word ".docx" file explaining a few aspects of things. That hidden text doesn't show in the PDF nor HTML versions. This is an "OGF" document in that it has all the OGF specified sections, change history page, etc. They just use different fonts, A4 pages, and some OGF backmatter sections are relocated to the front matter to facilitate dual maintenance of an OGF-track and ISO-PAS submission flavor of this document. This is setup so making a new ISO submission from this requires changing the page headings/footings (while preserving their size so page breaks don't change), and replacing the front matter pages. Note: there are some ISO formatting things I chose not to do. One is changing all table captions to be at the top of the table. The example ISO standards document template is also uploaded so you can see the preferred style and ISO front matter. https://github.com/OpenGridForum/DFDL/blob/master/docs/Word_template_for_IS…

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FYI: ASN.1 Encoding Control Notation (ECN) compared to DFDL
by Mike Beckerle 01 Oct '25

01 Oct '25

ASN.1 ECN has been an ISO standard thing for a while. ECN lets you add representation information to the ASN.1 schema, which sounds roughly DFDL-like. So now with DFDL being an ISO standard the obvious thing arises to compare/contrast them. So I did a quick exercise in that direction. An AI (with my help) created an equivalent ASN.1 Schema + ECN from the FakeTDL format specification text *document *on github. (FakeTDL is a small example of a fictitious military tactical data link on github DFDLSchemas) This PR exhibits that ASN.1 and ECN code and does some comparison. They’re not particularly equivalent – some limitations of ECN become apparent even in this small example. https://github.com/DFDLSchemas/faketdl/pull/12/files This is the chatGPT5 session I used to create the example (fairly long) https://chatgpt.com/share/68dd112a-3140-800f-ab7c-c0d043c0460a I asked it a bunch more things about ASN.1 ECN that go beyond just this example. By the end of this it was speculating too much, and confusing some concepts, but overall this was quite useful. Mike Beckerle Apache Daffodil PMC | daffodil.apache.org OGF DFDL Workgroup Co-Chair | www.ogf.org/ogf/doku.php/standards/dfdl/dfdl Owl Cyber Defense | www.owlcyberdefense.com

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