<simpleType name="NullEnumeration">
<restriction base="string">
<enumeration value="inapplicable"/>
<enumeration value="missing"/>
<enumeration value="template"/>
<enumeration value="unknown"/>
<enumeration value="withheld"/>
</restriction>
</simpleType> <simpleType name="NullType">
<union memberTypes="gml:NullEnumeration anyURI"/>
</simpleType>