Topological Objects

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The following diagram illustrates the topological hierarchy.

Element	Definition
Body	The highest level of model object, It has set of connected faces and wires, which bounds the outside of a solid or an internal void.
Face	A connected portion of a surface bounded by a set of loops.
Loop	A connected circuit of coedges. Generally, loops are closed, having no actual start or end point.
Wire	A connected set of edges that are not attached to a face.
Coedge	Represents the use of an edge by a face or wire. Coedge can be tolerant, that exists only on a tolerant edge.
Edge	A connected portion of a curve bounded by vertices. Edge can be a a tolerant edge, that represents an edge that does not lie within the system's positional tolerance of a face.
Vertex	A boundary of an edge. A Vertex corresponds to a point in 3D space. Vertex can be a tolerant that represents a vertex that does not lie within the system's positional tolerance of an edge.