# File lib/dm-serializer/xml_serializers/libxml.rb, line 18
        def self.add_node(parent, name, value, attrs = {})
          value_str = value.to_s unless value.nil?
          node = ::LibXML::XML::Node.new(name, value_str)
          attrs.each do |attr_name, attr_val|
            node[attr_name] = attr_val
          end
          parent << node
          node
        end