ISO 10303-521:2011

Industrial automation systems and integration — Product data representation and exchange — Part 521: Application interpreted construct: Manifold subsurface

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ISO 10303-521:2011 specifies the integrated resource constructs for Manifold subsurface.
The following are within the scope of ISO 10303-521:2011:

3D geometry;
advanced faces;
connected face sub sets;
mappings and geometric transformations;
open shells;
relationships between domains of topological objects;
subedges;
subfaces;
unbounded geometry with associated topological boundaries;
use of topology to bound geometric entities.