<xs:attribute name="StaffType" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">Defines the type of staff covered by the TourCode.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="Current">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Staff currently employed (i.e., not retired)</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="Duty">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Staff travelling on duty (e.g., deadheading crew).</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="CabinCrew">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Cabin crew staff.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="Retired">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Retired staff.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="TechCrew">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Staff travelling as technical crew.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="UnaccompaniedFamilyMember">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Family travelling without the airline staff family member.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="OtherAirlinePersonnel">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Personnel employed by another airline.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>