Dieter,

> Doug Morse writes:
>  > ... negating a ZCatalog index lookup ...
> 
> Only ZCatalog text indexes support a restricted form of negation.
> Keyword and field indexes do not.
> Text indexes support only "and not":
> e.g. "Zope and not databases".
> Free standing "not" or combined with "or" (rather than "and")
> is not supported.

Super, thanks Dieter!  Not the answer I was hoping to hear,
but it least it's definitive. ;-)  

I am curious: Do others think this feature might be worth
adding to the ZCatalog?  If so, perhaps it should work its
way into a proper feature request...

Cheers!
Doug Morse
[EMAIL PROTECTED]

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