<complexType name="BoundingSurfacePropertyType">
  <annotation>
    <documentation>Property type that contains one object, which is a diggs:PlanarSurface, a diggs:CompositeSurface, a diggs:MultiPlanarSurface or a diggs:TriangulatedSurface inline, or refers to one with xlink:href. It holds one continuous bounding surface of a diggs:SurfaceBoundedSolid: a diggs:PlanarSurface, diggs:CompositeSurface, diggs:MultiPlanarSurface or diggs:TriangulatedSurface. It is narrower than diggs:SurfacePropertyType, which also admits diggs:MultiSurface: a collection of surfaces with no assumed adjacency cannot serve as one bounding surface, and a body in disjoint pieces is expressed with a diggs:MultiSurface footprint instead. That the members of a diggs:CompositeSurface, and the patches of a diggs:MultiPlanarSurface, share boundaries is a geometric condition this type cannot express; see diggs:SurfaceBoundedSolid.</documentation>
  </annotation>
  <sequence minOccurs="0">
    <choice>
      <element ref="diggs:PlanarSurface"/>
      <element ref="diggs:CompositeSurface"/>
      <element ref="diggs:MultiPlanarSurface"/>
      <element ref="diggs:TriangulatedSurface"/>
    </choice>
  </sequence>
  <attributeGroup ref="gml:OwnershipAttributeGroup"/>
  <attributeGroup ref="gml:AssociationAttributeGroup"/>
</complexType>