<element name="AbstractSurfacePatch" type="gml:AbstractSurfacePatchType" abstract="true">
<annotation>
<documentation>A surface patch defines a homogenuous portion of a surface.
The AbstractSurfacePatch element is the abstract head of the substituition group for all surface patch elements describing a continuous portion of a surface.
All surface patches shall have an attribute interpolation (declared in the types derived from gml:AbstractSurfacePatchType) specifying the interpolation mechanism used for the patch using gml:SurfaceInterpolationType.</documentation>
</annotation>
</element>
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