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The NOT logic is already working in Tridion Docs and can manually be added to a condition attribute, e.g.<li id="LI_guid" ishcondition="not (productname)"> .... </li>
It would be much easier to make use of it to also add this to the Condition Manager and not just AND and OR.
Also the NOR logic should work as well I believe, but haven't tested it. Suggest to also add this to the Condition Manager
