# File lib/active_ldap/xml.rb, line 17
      def to_s
        root = @options[:root]
        result = "<#{root}>\n"
        target_attributes.each do |key, values|
          values = normalize_values(values).sort_by {|value, _| value}
          if @schema.attribute(key).single_value?
            result << "  #{serialize_attribute_value(key, *values[0])}\n"
          else
            result << serialize_attribute_values(key, values)
          end
        end
        result << "</#{root}>\n"
        result
      end