ISO/TS 10303-1659:2006 specifies the application module for
Curve swept solid.

The following are within the scope of
ISO/TS 10303-1659:2006:

• the definition of an extruded solid along a b-spline curve as
  centerline and a fixed cross-section plus orientation;
• items within the scope of application module Elemental geometric shape, ISO/TS 10303-1004.