RE: Groups with non-zero intersections

Thanks to everyone for their suggestions and sample code.  I have to admit
that I completely forgot/neglected the issue of drawing order.

Just to clarify my understanding of things...

- <use> elements would have resulted in the same line segment being
drawn repeatedly, but would have looked right as they would all be drawn
the same
- CSS classes would work, but might look wrong because of z-order issues

Just for my information, if I had gone with the CSS classes solution is it
likely that my 30,000 classes would have overloaded the SVG browser?  I'm
thinking of the fact that repeatedly adding and removing large numbers of
options from an HTML <select> element will crash most browsers.

Thanks again!

Jason Foster