class KramdownRFC::ParameterSet

def ele(pn, attr=nil, defcontent=nil, markdown=false)
  val, an = van(pn)
  val ||= defcontent
  Array(val).map do |val1|
    v = val1.to_s.strip
    contents =
      if markdown
        ::Kramdown::Converter::Rfc2629::process_markdown(v)
      else
        escape_html(v)
      end
    %{<#{[an, *Array(attr).map(&:to_s)].join(" ").strip}>#{contents}</#{an}>}
  end.join(" ")
end