######################################################################
# Enhance the String class with a XML escaped character version of
# to_s.
#
class String #:nodoc:
  # XML escaped version of to_s
  def to_xs
    unpack('U*').map {|n| n.xchr}.join # ASCII, UTF-8
  rescue
    unpack('C*').map {|n| n.xchr}.join # ISO-8859-1, WIN-1252
  end
end