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Pattern matching

Is there a nice way to implement a pattern matcher in PCL that deals
with patterns of the form:

  (object slot value)

where at every position variables are allowed? I.e. the pattern matcher
should be able to find all objects with a given value in a given slot,
or find all slots of a given object, etc.

Many thanks,
Jiri Dvorak                  dvorak@iam.unibe.ch   or
Institute for Informatics    dvorak%iam.unibe.ch@relay.cs.net
University of Berne          UUCP: ..!uunet!mcvax!iam.unibe.ch!dvorak