Avoid the negated property path: Tracker SPARQL Library Reference Manual

## Avoid the negated property path

The `!` negation operator in property paths negate the match. For example:

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    SELECT ?s ?o { ?s !nie:url ?o }

This query looks for every other property that is not `nie:url`. The same reasoning than unrestricted predicates apply, since that specific query is equivalent to:

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    SELECT ?s ?o { ?s ?p ?o .
                   FILTER (?p != nie:url) }