A Product_surface_space is a Product_feature_space that consists of a set of surfaces within a Product_specification_or_set. These surfaces can change their positions and shapes as the Product_specification_or_set moves or deforms.
NOTE - A beam view of a structure is a Product_surface_space. Each member of the space is a surface that runs across the section of the beam.
The surface are usually chosen so that they are normal to a reference axis for the structure, for a reference state of the structure.
EXPRESS specification:
*) ENTITY Product_surface_space SUBTYPE OF (Product_feature_space); END_ENTITY; (*