<simpleType name="TimeIndeterminateValueType">
    <annotation>
        <documentation>These values are interpreted as follows: 
-	"unknown" indicates that no specific value for temporal position is provided.
-	"now" indicates that the specified value shall be replaced with the current temporal position whenever the value is accessed.
-	"before" indicates that the actual temporal position is unknown, but it is known to be before the specified value.
-	"after" indicates that the actual temporal position is unknown, but it is known to be after the specified value.
A value for indeterminatePosition may 
-	be used either alone, or 
-	qualify a specific value for temporal position.</documentation>
    </annotation>
    <restriction base="string">
        <enumeration value="after" />
        <enumeration value="before" />
        <enumeration value="now" />
        <enumeration value="unknown" />
    </restriction>
</simpleType>

• TimeIndeterminateValueType
• gml:indeterminatePosition