ISO 10303-214:2010(E)
A Csg_primitive is a basic solid object that may be combined with other solid objects, using regularized Boolean operations, in order to create more complex solid geometric elements.
A Csg_primitive is a type of Detailed_geometric_model_element.
Each Csg_primitive is a Right_circular_cylinder, a Right_angular_wedge, a Right_circular_cone, a Torus, a Block, or a Sphere.
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