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 IBM SWG, Hursley, UK 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-- dfdl-wg mailing list dfdl-wg@ogf.org https://www.ogf.org/mailman/listinfo/dfdl-wg Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU