simpleType NullEnumeration

namespace	http://www.opengis.net/gml
type	union of (restriction of xs:string, restriction of xs:string)
used by	simpleTypes  booleanOrNull doubleOrNull integerOrNull NameOrNull NullType stringOrNull
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.
source	<xs:simpleType name="NullEnumeration">   <xs:annotation>     <xs: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.        </xs:documentation>   </xs:annotation>   <xs:union>     <xs:simpleType>       <xs:restriction base="string">         <xs:enumeration value="inapplicable"/>         <xs:enumeration value="missing"/>         <xs:enumeration value="template"/>         <xs:enumeration value="unknown"/>         <xs:enumeration value="withheld"/>       </xs:restriction>     </xs:simpleType>     <xs:simpleType>       <xs:restriction base="string">         <xs:pattern value="other:\w{2,}"/>       </xs:restriction>     </xs:simpleType>   </xs:union> </xs:simpleType>

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