[DFDL-WG] Clarification: attributes in DFDL schema that are used not for data, but for other non-DFDL annotation elements.

[Steve Hanson]

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 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 at 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 at 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 
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