syntax question

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Newsgroups gmane.comp.ai.powerloom
Message-ID <[email protected]>
Is there a convenient way of defining a concept as a PROPER
sub-concept of another?  IIUC, defconcept with super-concepts makes no
assumptions about the new concept being a proper sub-concept of its
parent.  However, for a lot of modeling applications, this is the
standard case.  It would be nice if there was a handy syntactic form
for this.  Ordinarily, I would simply define a Lisp macro to generate
an expansion that was what I wanted, but the combination of Stella +
macros is a daunting one...
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