not( new FlowElementExpression( Extent.class ) ),
not( new FlowElementExpression( Tap.class ) ),
not( new FlowElementExpression( Checkpoint.class ) ),
not( new FlowElementExpression( Splice.class ) ),
not( new FlowElementExpression( Pipe.class, TypeExpression.Topo.SplitOnly ) ),
not( new NonSafeOperationExpression() ) ) );
}