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Документация по AutoCAD Map 3D компании Autodesk.

Здесь breakline - структурная линия.
Ниже приведено определение различных типов структурных линий:

You can define breaklines in one of four ways:

Standard: Defined by selecting 3D polylines.
Proximity: Defined by selecting a 3D polyline object in the drawing within the extents of the surface boundary. The XYZ coordinates of proximity breakline vertices are determined from the surface TIN points that are in closest proximity to the corresponding vertices of the defining points or entity.
Wall: A wall breakline is stored as a standard breakline, but defined differently: you provide an offset side for the entire breakline, and an elevation difference for each vertex, or for the entire breakline.
Non-destructive: A non-destructive breakline maintains the integrity of the original surface.