Explain the problem as you see it
Right now the query clause NOT: PARENT DESCENDANTS WITH REFS does not work. Computation never finishes.
Why is this a problem for you?
It is useful if I have a bunch of queries for a certain #tag with various constraints, all under one node, and I want to find all #tag that was not covered by those queries. Incredibly useful when I'm classifying instances of a tag and want to find what is left out.
Suggest a solution
Such a query is an instance of Russell Paradox. So understandably it cannot be computed. But it is easy to get around it. Queries with constraints referring to parent/grandparent should simply not search inside themselves.