# File lib/sanitize.rb, line 2284
    def to_ncr
      XPath.each(self, '//*') { |el|
        el.texts.each_index  {|i|
          el.texts[i].value = el.texts[i].to_s.to_ncr
        }
        el.attributes.each { |name,val|
          el.attributes[name] = val.to_ncr
        }
      }
      return self
    end