def containsbb_exclusive(self, x):
        """
        Returns true if the given BoundingBox x is contained within the
        bounding box, where at least one of the boundaries of the box has
        to be exclusive.
        """
        left, bottom, right, top = self.aarect().lbrt()
        leftx, bottomx, rightx, topx = x.aarect().lbrt()
        return (left <= leftx) and (bottom <= bottomx) and (right >= rightx) and (top >= topx) and\
               (not ((left == leftx) and (bottom == bottomx) and (right == rightx) and (top == topx)))
Returns true if the given BoundingBox x is contained within the
        bounding box, where at least one of the boundaries of the box has
        to be exclusive.