<xs:attribute name="Type" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">Specifies how the service fee has been determined, i.e., per person, total.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="PerPassenger">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The amount is per passenger.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="TransactionTotal">
                <xs:annotation>
                    <xs:documentation xml:lang="en">This is the actual amount of the service fee.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="PerMCO">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The amount is determined by multiplying by the number of passengers.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>