criterion

<xsd:element name="criterion">
        <xsd:complexType>
            <xsd:complexContent>
                <xsd:extension base="beans:identifiedType">
                    <xsd:attribute name="fieldName" type="xsd:string" use="required"/>
                    <xsd:attribute name="operator" type="operator-types" use="required"/>
                    <xsd:attribute name="value" type="xsd:string"/>
                </xsd:extension>
            </xsd:complexContent>
        </xsd:complexType>
    </xsd:element>