<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>