class CFPropertyList::CFString

It will convert the value to UTF-16BE if necessary (i.e. if non-ascii char contained)
This class holds string values, both, UTF-8 and UTF-16BE

def to_binary(bplist)

convert to binary 
def to_binary(bplist)
  bplist.string_to_binary(@value);
end

def to_xml(parser)

convert to XML 
def to_xml(parser)
  n = parser.new_node('string')
  n = parser.append_node(n, parser.new_text(@value)) unless @value.nil?
  n
end