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Re: Iteration Facilities

Indeed MAPF is a very modest attempt to abstract out the
"MAP" type facilities.  the LOOP facility is the more general
user-oriented approach, and it is currently being distributed 
with MacLISP.   LOOP grew out of several years of evolving
iteration facilities, heavily influenced by InterLISP's;  one
very interesting aspect about it is that the source code works
well in all of PDP10 MacLISP, MULTICS MacLISP, the LISPMachine,
and NIL.  Glenn Burke and Dave Moon have a printed manual for
using it, but the machine-source for that manual is itself
quite readable;  see the file  LIBDOC;LOOP DOC  on any ITS machine.