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trackback_validate(ignore_unknown_element, tags, uri) private

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# File lib/rss/trackback.rb, line 14
    def trackback_validate(ignore_unknown_element, tags, uri)
      return if tags.nil?
      if tags.find {|tag| tag == "about"} and
          !tags.find {|tag| tag == "ping"}
        raise MissingTagError.new("#{TRACKBACK_PREFIX}:ping", tag_name)
      end
    end
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