# File lib/uri_template/rfc6570/expression.rb, line 51
    def level
      if @variable_specs.none?{|_,expand,ml| expand || (ml > 0) }
        if @variable_specs.size == 1
          return self.class::BASE_LEVEL
        else
          return 3
        end
      else
        return 4
      end
    end