If we want to tell Cassie about individuals that satisfy certain
descriptions without giving those individuals a name, we can use base nodes
(UM§§1.4,
2.7).
These are nodes that have no outgoing arcs; i.e., they
have no structural information. All that we know about them is what is
asserted about them. (On the difference between structural and
assertional information, see
Woods 1975.) To get started,
evaluate:
(resetnet t)
(define agent act object member class)
