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standard by International Organization for Standardization, 12/01/1999
This part of ISO 10303 specifies the interpretation of the generic resources in order to satisfy the following requirements:
for the description of a three dimensional shape by means of a boundary representation model with planar faces and implicit straight line edges;for the composition of one or more such shapes as a faceted_brep_shape_representation.The following are within the scope of this part of ISO 10303:
3D geometry;B-reps;B-rep models;faceted B-reps;polyloops;unbounded geometry;use of topology to bound geometric entities;geometric transformations.The following are outside the scope of this part of ISO 10303:
2D geometry;curves;explicit edge definitions;surfaces other than planes;offset curves and surfaces.