Derived Types: PolylineB, PolylineN An abstract class that
serves as a base to its derived types, representing a collection
of one or many paths. The paths do not have to be connected to
each other. A polyline can be defined either as a
PointCollection, SegmentCollection, or GeometryCollection. Each
collection type allows the user to access and manipulate
different aspects of the polyline geometry. To define a polyline
containing many disjoint paths, the polyline must be defined as
a GeometryCollection to which preconstructed path geometries are
added. Adding segments to a polyline defined as a
SegmentCollection, or points to a polyline defined as a
PointCollection, assumes that the polyline is a single path of
connected segments.