<xs:attribute name="Type" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">Specifies the type of date.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="LastRuleChange">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The last date the rule was changed.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="RuleBecomesInvalid">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The date after which the rule is no longer valid.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="RestrictiveFareEffective">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The date on which the restrictive fare becomes effective.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="RestrictiveFareDiscontinue">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The date on which the restrictive fare is discontinued.
</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>