OpenGIS simpleType NullEnumeration

Target Namespace	http://www.opengis.net/gml
Declared Namespaces	xmlns:gml=http://www.opengis.net/gml xmlns:sch=http://www.ascc.net/xml/schematron xmlns:xlink=http://www.w3.org/1999/xlink xmlns=http://www.w3.org/2001/XMLSchema

<simpleType name="NullEnumeration">
    <annotation>
        <documentation>
Some common reasons for a null value:

innapplicable - the object does not have a value
missing - The correct value is not readily available to the sender of this data.
Furthermore, a correct value may not exist.
template - the value will be available later
unknown - The correct value is not known to, and not computable by, the sender of this data.
However, a correct value probably exists.
withheld - the value is not divulged

other:reason - as indicated by "reason" string

Specific communities may agree to assign more strict semantics when these terms are used in a particular context.
        </documentation>
    </annotation>
    <union>
        <simpleType>
            <restriction base="string">
                <enumeration value="inapplicable"/>
                <enumeration value="missing"/>
                <enumeration value="template"/>
                <enumeration value="unknown"/>
                <enumeration value="withheld"/>
            </restriction>
        </simpleType>
        <simpleType>
            <restriction base="string">
                <pattern value="other:\w{2,}"/>
            </restriction>
        </simpleType>
    </union>
</simpleType>

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simpleType {http://www.opengis.net/gml}NullEnumeration

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