class StandardError
  def to_xml(options = {})
    options[:indent] ||= 2
    xml = options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent])
    xml.instruct! unless options[:skip_instruct]
    xml.tag!(self.class.name.demodulize.underscore.dasherize) do
      xml.tag!(:message, message)
    end
  end
end