# File lib/dm-serializer/xml/libxml.rb, line 11
        def self.root_node(doc, name, attrs = {})
          root = ::LibXML::XML::Node.new(name)

          attrs.each do |attr_name, attr_val|
            root[attr_name] = attr_val
          end

          doc.root.nil? ? doc.root = root : doc.root << root
          root
        end