[DFDL-WG] clarification wanted: fixed values
Steve Hanson
smh at uk.ibm.com
Wed Sep 5 12:09:53 EDT 2012
Hi Mike
Yes the fixed attribute and all the other schema facets are only used when
validating. The dfdl:checkConstraints() function is provided to allow a
dfdl:assert or dfdl:discriminator to check that the value of an element
obeys its schema constraints.
Regards
Steve Hanson
Architect, Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
From: Mike Beckerle <mbeckerle.dfdl at gmail.com>
To: dfdl-wg at ogf.org
Date: 05/09/2012 16:32
Subject: [DFDL-WG] clarification wanted: fixed values
Sent by: dfdl-wg-bounces at ogf.org
The spec states that the fixed facet is only used for validation.
That is, it works like default in that it supplies a default that can be
used when parsing and unparsing, but the comparison of an existing data
value with the schema-specified fixed value is only done for validation.
This means that a value not agreeing with the fixed value specified in the
schema would never cause backtracking.
Is this right? It seems awkward to me that I have to use a dfdl:assert
annotation to achieve this. That said, however, I can achieve the
behaviour I need. it's just more verbose than I wanted.
Is this what the current IBM implementation does?
Thanks
--
Mike Beckerle | OGF DFDL WG Co-Chair
Tel: 781-330-0412
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