__to_xpath_helper(node) private

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# File lib/rexml/element.rb, line 690
    def __to_xpath_helper node
      rv = node.expanded_name.clone
      if node.parent
        results = node.parent.find_all {|n| 
          n.kind_of?(REXML::Element) and n.expanded_name == node.expanded_name 
        }
        if results.length > 1
          idx = results.index( node )
          rv << "[#{idx+1}]"
        end
      end
      rv
    end
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