Mike, is it possible to post a cut-down example that shows enough to give the error in Daffodil, and I'll see if IBM DFDL gives a similar error.

Regards

Steve Hanson

IBM Hybrid Integration, Hursley, UK
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
smh@uk.ibm.com
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From: Mike Beckerle <mbeckerle.dfdl@gmail.com>
To: dfdl-wg@ogf.org
Date: 20/02/2018 16:44
Subject: [DFDL-WG] Clarification: attributes in DFDL schema that are used not for data, but for other non-DFDL annotation elements.
Sent by: "dfdl-wg" <dfdl-wg-bounces@ogf.org>

Interesting issue.

DFDL doesn't allow use of attributes.

But we have a user that has a DFDL schema to which they also want to add other non-DFDL annotations.

Like DFDL itself, this other annotation language has a variety of annotation elements that appear inside xs:appinfo blocks with specific source attribute specified. A DFDL processor should be ignoring these.

Those other annotation elements have attributes (as do DFDL's annotation elements.)

But Daffodil issues a schema definition error on the attribute declarations of this other annotation-language schema. This because it has no way of telling if these attribute declarations are for use *only* in annotations that it will ignore, or if they are used for modeling data.

Question is: Is it acceptable for a DFDL annotation to just say "Nowhere in the extended schema - all files - can there be any attribute declarations.", or do we need to accommodate attributes and in fact every XSD construct that DFDL disallows, so long as they're not being used to model data?

Really there's two questions here. First, does the DFDL specification take (or need to take) a position on this. Second, what's a practical choice for a DFDL implementation like Daffodil to take here.

...mikeb

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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