This property element either references a surface via the XLink-attributes or contains the surface element. A surface element is any element, which is substitutable for gml:AbstractSurface.
<element name="surfaceMember" type="gml:SurfacePropertyType"><annotation><documentation>This property element either references a surface via the XLink-attributes or contains the surface element. A surface element is any element, which is substitutable for gml:AbstractSurface.</documentation></annotation></element>