new (REXML::IOSource)

    # File rexml/source.rb, line 107
      def initialize arg, block_size=500
    			@er_source = @source = arg
    			@to_utf = false
    			# READLINE OPT
    			# The following was commented out when IOSource started using readline
    			# to pull the data from the stream.
    			#@block_size = block_size
    			#super @source.read(@block_size)
    			@line_break = '>'
    			super @source.readline( @line_break )
    		end