[pstricks] Relative nodes

[Joel Salomon]

This has got to be in the documentation somewhere, but it's late and
I'm tired so I'm not finding it.  How can I place a node relative to
another?
	\pnode(5,5){OA}
	\pnode[origin=OA](-1.5,-1){OAIn}
	\pnode[origin=OA](1.5,0){OAOut}
doesn't seem to work.

--Joel