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missing OR ptype

What would it take to get an OR presentation type in clim?
(and for that matter, AND seems to be missing as well).

I have a hard time writing a reasonably interesting presentation
type without using disjunction.  Or perhaps someone wants to tell
me that I don't really want to do that either...

I have looked in the sources, and I think I could write it myself
if INPUT-NOT-OF-REQUIRED-TYPE did something like signal a condition
or did a throw to some tag.  An OR parser seems simply to iterate
down the disjunction of types, doing ACCEPT, until no failure is

jeff morrill

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