Shell Based Surface Model

See functional part: fp_represent_face_based_surface_model

Identifies the information requirements for provision of a 3D shell based planar surface model shape.
A shell based surface model is described by a set of shells. A shell defines a boundary (closed shell) or a closed shell with holes (open shell).
A shell is defined as a subtype of a connected face set which in turn comprises a set of faces. The connected face set must be defined.
A face in one shell (set of connected faces) may overlap a face in another shell (set of connected faces) if there is a shared intersection. This enables a complete shell based surface model to be described by the boundary determined by a set of shells (connected face sets).

The value of the representation identifier for the surface model representation should be set to 'Facetation'
The value of the representation type for the surface model representation should be set 'SurfaceModel'