<xs:attribute name="SingleVendorInd">
    <xs:annotation>
        <xs:documentation xml:lang="en">Indicates if program is affiliated with a group of related offers accumulating credits.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="SingleVndr">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Indicates the program is not part of an alliance.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="Alliance">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Indicates the program is part of an alliance.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>