# File lib/iq_rdf/blank_node.rb, line 29
    def to_s(parent_lang = nil)
      "[\n#{(nodes.map{|pred| "#{pred} #{pred.nodes.map{|o| o.to_s(pred.lang || parent_lang)}.join(", ")}"}.join(";\n")).gsub(/^/, "    ")}\n]"
    end