# File lib/xml/dom/core.rb, line 2147
      def getElementsByTagName(tagname)
        ret = NodeList.new
        @children.each do |node|
          if node.nodeType == ELEMENT_NODE
            if tagname == '*' || node.nodeName == tagname
              ret << node
            end
            ret << node.getElementsByTagName(tagname)
          end
        end if @children
        ret
      end