# File rexml/source.rb, line 106
  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)
			#super @source.readline( '>' )
		end