<element name="controlPoint">
	<annotation>
		<documentation>The corners of the triangles in the TIN 
 often referred to as pots. ControlPoint shall contain a 
 of the GM_Position used as posts for this TIN. Since each  
 contains triangles, there must be at least 3 posts. The 
  order in which these points are given does not affect the 
  surface that is represented. Application schemas may add 
  information based on ordering of control points to facilitate 
  the reconstruction of the TIN from the control points.</documentation>
	</annotation>
	<complexType>
		<choice>
			<element ref="gml:posList"/>
			<group ref="gml:geometricPositionGroup" minOccurs="3" maxOccurs="unbounded"/>
		</choice>
	</complexType>
</element>