# File kwartz.rb, line 1268
        def exec_nodelist(nodelist, str, level)
            list = nodelist.list
            #
            str << '  ' * level << "<nodelist>\n"
            list.each do |node|
                exec(node, str, level+1)
                #node.execute(self, str, level+1)
            end
            return str
        end