For the case where an attribute is constrained to '0'
existence i.e.
state existence matches {0} .....
what should follow as the rest of the attribute
constraint? Technically, the rest of the definition
is superfluous as we have already stated that the
attribute must not exist, but the
'matches' clause needs to exist in the grammar. Should
it be matched to *, or should it be empty?
state existence matches {0} matches {*}
or
state existence matches {0} matches {}
(I'm not sure the grammar allows this)
Andrew
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