A composite surface is a collection of connected solids. The components can be simple solids (boxes, boundary-representation solids, and extrusion solids), constructive solid geometry (CSG) solids, or other composite solids.
The topological requirement of a composite surface is that the collection must share faces, so that the collection can represent a contiguous solid.
Contains: IFMESolid (0..n)
Contained by: IFMECompositeSolid, IFMEMultiSolid