# File /home/ser/Work/rexml/rexml/source.rb, line 81
  def encoding(str)
			if str=~/^7677/
				'UTF16'  #unicode big endian
			elsif str=~/^7776/
				'UNILE' #unicode litle endian
			elsif str=~/([00-77][00-77])/  
				#not a guaranteed test won't detect random pairs
				'UTF8'
			else
				'ASC'
			end
		end