prefix_of( node, namespace=nil ) private

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# File lib/rexml/light/node.rb, line 184
      def prefix_of( node, namespace=nil )
        if not namespace
          name = node.name
          name =~ NAMESPLIT
          $1
        else
          ns = at(3).find { |k,v| v == namespace }
          ns ? ns : prefix_of( node.parent, namespace )
        end
      end
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