# File lib/iq_rdf/blank_node.rb, line 37
    def build_xml(xml, &block)
      block.call({}, lambda {
          attrs = {}
          attrs["xml:lang"] = self.lang if self.lang
          xml.rdf(:Description, attrs) do
            self.nodes.each do |predicate|
              predicate.build_xml(xml)
            end
          end
        })
    end