1-16chrd, an interesting idea...

[Steffen]

the file is already present on the PT as "empty.dat":
http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=p/empty.dat

I do not like your suggestion of "empty ring", because
I cannot imagine what an "empty ring" should be.
And if this would be an empty ring, then wouldn't it also be an "empty sphere"?
Empty is empty. Alternative names could be "nothing" or "nil" etc.

I also now uploaded the 1-16chrd.dat to the PT:
http://www.ldraw.org/cgi-bin/ptdetail.cg...16chrd.dat