# File lib/xml/dom/core.rb, line 34
  def XML.charRef(s)
    str = s.dup
    str.gsub!("&", "&")
    str.gsub!("<", "&lt;")
    str.gsub!(">", "&gt;")
    str.gsub!("'", "&apos;")
    str.gsub!('"', "&quot;")
    str
  end