<simpleType name="TimePositionUnion">
  <annotation>
    <documentation>The simple type gml:TimePositionUnion is a union of XML Schema simple types which instantiate the subtypes for temporal position described in ISO 19108. An ordinal era may be referenced via URI. A decimal value may be used to indicate the distance from the scale origin . time is used for a position that recurs daily (see ISO 19108:2002 5.4.4.2). Finally, calendar and clock forms that support the representation of time in systems based on years, months, days, hours, minutes and seconds, in a notation following ISO 8601, are assembled by gml:CalDate</documentation>
  </annotation>
  <union memberTypes="gml:CalDate time dateTime anyURI decimal"/>
</simpleType>