ISO/TS 10303-1501:2004 specifies the application module
Edge based wireframe.

The following are within the scope of
ISO/TS 10303-1501:2004:

• the representation of wireframe models that are described by a graph of
  edges and vertices where the edges intersect only at their vertices;
• the representation of a wireframe model by one or more connected edge sets
  that shall not overlap or intersect except at their vertices or edges;
• the representation of points defined in a three-dimensional coordinate space;
• the representation of curves, including b-splines, defined in a three-dimensional coordinate space;
• the representation of a single wireframe model or an assembly of wireframe model.