<group name="geometricPositionListGroup">
  <annotation>
    <documentation>GML supports two different ways to specify a list of geometric positions: either by a sequence of geometric positions (by reusing the group definition) or a sequence of direct positions (element posList). The posList element allows for a compact way to specify the coordinates of the positions, if all positions are represented in the same coordinate reference system.</documentation>
  </annotation>
  <choice>
    <element ref="gml:posList"/>
    <group ref="gml:geometricPositionGroup" maxOccurs="unbounded"/>
  </choice>
</group>