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This part of ISO 10303 specifies the interpretation of the integrated resources to satisfy requirements for the description of geometric shapes by means of non-manifold surface models.

The following are within the scope of this part of ISO 10303:

• 3D points;
• points defined in the parameter space of curves or surfaces;
• 3D curves;
• curves defined in the parameter space of surfaces;
• the elementary curve types line, circle, ellipse, parabola, and hyperbola;
• intersection curves;
• polylines that consist of at least three points;
• the elementary surface types plane, cylinder, cone, torus, and sphere;
• swept surfaces created by rotation or linear extrusion of a curve;
• sculptured curves and surfaces;
• trimming of curves and surfaces using topological entities;
• composition of curves and surfaces using topological entities;
• replication of curves, surfaces, and surface models;
• 3D offsets of curves and surfaces;
• non-manifolds.

The following are outside the scope of this part of ISO 10303:

• unbounded geometry;
• self-intersecting geometry;
• geometry in a 2D cartesian coordinate space;
• replication of points;
• topology without an association to a corresponding geometric domain.