 emerge.  The
     caveats are (1) that it is well constructed (2) that it
     enables Cyc to do things that it currently cannot or cannot
     without great difficulty (3) that the expense of adopting a
     new upper level be reasonable (4) and that the discernible
     advantages to Cyc from (1),(2) &amp; (3) above are not marginal.
     (-- Doug, I hope this is an accurate representation of your
     views.)   I believe this is reasonable and also sets a default
     as to what is worth doing.  Another