<xs:attribute name="Type" use="optional">
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="EffectiveTravel">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The first travel date for this fare.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="DiscontinueTravel">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The last travel date for this fare.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="FirstTicketing">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The first date for ticketing.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="LastTicketing">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The last date for ticketing.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="TravelCompletion">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The date by which travel must be completed.
</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>