Feature Edges
Feature Edge – a one-dimensional spatial entity that defines a path through 2D or 3D space
The geometry of an edge is defined by an ordered collection of two or more distinct coordinate tuples
An edge is bounded by a node at each of its two endpoints (conceptually, the endpoints are included in the edge, but they are not stored as part of it)
The orientation of an edge is defined by the order of its coordinate tuples
An edge may not intersect with or overlap itself, or with any other edges (Exception: Feature Topology Level 1)
Two or more edges may meet only at a common node