<xs:attribute name="CurrencyOption" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">May be used to specify why an override currency is being included.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="FilingCurrency">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Display fares filed in a specific currency (i.e., the override currency).</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="ConvertToCurrency">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Convert fares to a specific currency
 (i.e., the override currency).</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>