<xs:element name="originPlatform">
    <xs:complexType>
        <xs:sequence />
        <xs:attribute name="platform" use="required">
            <xs:simpleType>
                <xs:restriction base="xs:NMTOKEN">
                    <xs:enumeration value="email" />
                    <xs:enumeration value="mobile" />
                    <xs:enumeration value="broadcast" />
                    <xs:enumeration value="web" />
                    <xs:enumeration value="print" />
                    <xs:enumeration value="recordableMedia" />
                    <xs:enumeration value="other" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>
</xs:element>