parid2269 | Mon, 24 Feb 2003 12:59:59
An r-node serves as the R endpoint of one or more CR arcs. Like all nodes, it may serve as the x endpoint of of any number of Cx arcs. It cannot serve as any other endpoint types.
Behavior: Serves as the R endpoint of CR, RC arcs. May serve as x endpoint of any Cx arcs.
Simplified explanation. "It cannot serve as any other endpoint types." is superfluous. The definition says what arcs it can serve as an endpoint and the point should not be belabored.