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Attribute values that a Wme should NOT have in order for this condition to be true
@type attribute() :: String.t() | atom()
@type fields() :: [owner: owner(), attribute: attribute()]
@type owner() :: String.t() | atom()
@type t() :: %Retex.Fact.NotExistingAttribute{attribute: attribute(), owner: owner()}
@spec new(fields()) :: t()