<xs:attribute name="GlobalIndicatorCode" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">AP - Atlantic Ocean
PA - Pacific Ocean
WH - Western Hemisphere
EH - Eastern Hemisphere
PO - Polar Route
TS - Trans Siberia Route
AP - Atlantic/Pacific Round-the-World</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="AT" />
            <xs:enumeration value="PA" />
            <xs:enumeration value="WH" />
            <xs:enumeration value="EH" />
            <xs:enumeration value="PO" />
            <xs:enumeration value="TS">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Trans Siberian.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="AP">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Atlantic Pacific.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="SP" />
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>