Re: [DFDL-WG] checkConstraints example?

26 Mar 2013

      We haven't implemented the recoverableError feature of assertions yet, but
that combined with checkConstraints would get you a warning about
constraint failure rather than a backtrack I believe.

This might be useful for "spot" validation rather than validation of
everything.

...mike

On Tue, Mar 26, 2013 at 7:48 AM, Steve Hanson <smh@uk.ibm.com> wrote:
...
James
dfdl:checkConstraints() does not validate against a specific facet, it
validates against all facets and the fixed attribute. So it checks that a
simple element conforms to its simple type.  It does exactly the checks
that switching on validation would do, but it causes a processing error
instead of a validation error when it fails, enabling the parser to
backtrack.
<xsd:element name="DayOfTheWeek“ minOccurs="0" …>
  <xsd:simpleType>
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value="Mon" />
      <xsd:enumeration value="Tue" />
      <xsd:enumeration value="Wed" />
      …
    </xsd:restriction>
  </xsd:simpleType>
  <xsd:annotation>
    <xsd:appinfo source="http://www.ogf.org/dfdl/">
        <dfdl:discriminator>dfdl:checkConstraints()</dfdl:discriminator>
    </xsd:appinfo>
  </xsd:annotation>
</xsd:element>
Regards
Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
IBM SWG, Hursley, UK*
**smh@uk.ibm.com* <smh@uk.ibm.com>
tel:+44-1962-815848
From:        "Garriss Jr., James P." <jgarriss@mitre.org>
To:        "dfdl-wg@ogf.org" <dfdl-wg@ogf.org>,
Date:        26/03/2013 11:39
Subject:        [DFDL-WG] checkConstraints example?
Sent by:        dfdl-wg-bounces@ogf.org
------------------------------
Can you please supply an example of using checkConstraints to valid an
enumeration?  There’s not one in the spec, and none of the tutorials I have
demo this.
Suppose I have this DFDL:
<xsd:element name="DayOfTheWeek“…>
  <xsd:simpleType>
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value="Mon" />
      <xsd:enumeration value="Tue" />
      <xsd:enumeration value="Wed" />
      …
    </xsd:restriction>
  </xsd:simpleType>
</xsd:element>
TIA--
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