<Point X="50" Y="100" Z="50" />
<Point3D .../> describes a point in x-, y-, and z-coordinates. Point3D is used primarily to describe more complex 3-D shapes.
Point3D is often declared through the use of abbreviated markup syntax. Wherever an attribute is specified as a Point, it can be declared as a comma-separated triplet of Double values representing the x-coordinate, y-coordinate, and z-coordinate, respectively:
<Element SomePoint3DAttribute="0,0,0" />