<xs:element name="SignatureOnFile" minOccurs="0">
    <xs:annotation>
        <xs:documentation>Indicates if the signature is authorized as a form of guarantee.
In some countries, the customer can sign the payment card slip as a form of guarantee.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:attribute name="SignatureOnFileIndicator" type="xs:boolean" use="optional">
            <xs:annotation>
                <xs:documentation xml:lang="en">When true, indicates a signature has been obtained.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attributeGroup ref="EffectiveExpireOptionalDateGroup">
            <xs:annotation>
                <xs:documentation xml:lang="en">Provides the date range for which the signature is accepted for a guarantee.</xs:documentation>
            </xs:annotation>
        </xs:attributeGroup>
    </xs:complexType>
</xs:element>