Three subclasses of <path> are exposed in the DUIM-Extended-Geometry library, each of which provides the ability to create instances of particular types of line. Their usage is relatively obvious.
<line>This class is used to create straight lines between two points on a drawable object.
<elliptical-arc> <polyline>This class is used to create lines that pass through an arbitrary set of coordinates. It produces a jagged line with vertices at each coordinate.