[DFDL-WG] checkConstraints example?

[Mike Beckerle]

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 at 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 at uk.ibm.com* <smh at uk.ibm.com>
> tel:+44-1962-815848
>
>
>
> From:        "Garriss Jr., James P." <jgarriss at mitre.org>
> To:        "dfdl-wg at ogf.org" <dfdl-wg at ogf.org>,
> Date:        26/03/2013 11:39
> Subject:        [DFDL-WG] checkConstraints example?
> Sent by:        dfdl-wg-bounces at 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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>
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>



-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com
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