<simpleType name="CodeTimeReferenceBaseType">
    <union>
        <simpleType>
            <restriction base="string">
                <enumeration value="UTC" />
                <enumeration value="UTC-12" />
                <enumeration value="UTC-11" />
                <enumeration value="UTC-10" />
                <enumeration value="UTC-9" />
                <enumeration value="UTC-8" />
                <enumeration value="UTC-7" />
                <enumeration value="UTC-6" />
                <enumeration value="UTC-5" />
                <enumeration value="UTC-4" />
                <enumeration value="UTC-3" />
                <enumeration value="UTC-2" />
                <enumeration value="UTC-1" />
                <enumeration value="UTC+1" />
                <enumeration value="UTC+2" />
                <enumeration value="UTC+3" />
                <enumeration value="UTC+4" />
                <enumeration value="UTC+5" />
                <enumeration value="UTC+6" />
                <enumeration value="UTC+7" />
                <enumeration value="UTC+8" />
                <enumeration value="UTC+9" />
                <enumeration value="UTC+10" />
                <enumeration value="UTC+11" />
                <enumeration value="UTC+12" />
                <enumeration value="UTC+13" />
                <enumeration value="UTC+14" />
            </restriction>
        </simpleType>
        <simpleType>
            <restriction base="string">
                <pattern value="OTHER(:(\w|_){1,58})?" />
            </restriction>
        </simpleType>
    </union>
</simpleType>

• CodeTimeReferenceBaseType
• aixm:CodeTimeReferenceType
• aixm:timeReference