# File src/rexml/source.rb, line 116
                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( "\n" )
                        super @source.readline( @line_break )+@source.read
                        @line_break = encode( '>' )
                end