<simpleType name="CodeSurfacePreparationBaseType">
    <union>
        <simpleType>
            <restriction base="string">
                <enumeration value="NATURAL" />
                <enumeration value="ROLLED" />
                <enumeration value="COMPACTED" />
                <enumeration value="GRADED" />
                <enumeration value="GROOVED" />
                <enumeration value="OILED" />
                <enumeration value="PAVED" />
                <enumeration value="PFC" />
                <enumeration value="AFSC" />
                <enumeration value="RFSC" />
                <enumeration value="NON_GROOVED" />
            </restriction>
        </simpleType>
        <simpleType>
            <restriction base="string">
                <pattern value="OTHER(:(\w|_){1,58})?" />
            </restriction>
        </simpleType>
    </union>
</simpleType>

• CodeSurfacePreparationBaseType
• aixm:CodeSurfacePreparationType
• aixm:preparation