I should also note that after I had posted my initial query
about existence constraints last month I found a section in the ADL spec
that actually deals with this
section 4.3.5 "Any" constraints
"however, it also provides an opportunity to specify an existence constraint
which might be narrower than that in the information model."
So my interpretation would be that the correct syntax
for a zero existence constraint would be therefore
attribute existence matches {0} matches {*}
Andrew
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