> So Rob, are you saying that anytime you have a prefix assignment,
> parenthesis become mandatory, at least for the search clause that the
> assignment precedes?
No, just that the easiest way to figure out the scope of a prefix
assignment is to put in all the parens.
(Or actually the easiest way is to put it through a parser and look at the
output :) but by hand is to add in all the parens)
So your queries without the parens are perfectly legal and unambiguous,
but the parens make it clearer as to the scope of each prefix.
> > > How about:
> > > >dc1="core-v1" dc1.title=first and >dc1="core-v1a" dc1.title=second
> > > and dc1.title=third
> > Lets remove the mappings and put in the parens:
> > ((dc1.title=first and dc1.title=second) and dc1.title=third)
> > And put back the mappings:
> > >dc1=v1 ((dc1.title=first and >dc1=v1a dc1.title=second) and
> > dc1.title=third)
,'/:. Dr Robert Sanderson ([log in to unmask])
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