# File src/rexml/encodings/US-ASCII.rb, line 4
                def to_us_ascii content
                        array_utf8 = content.unpack('U*')
                        array_enc = []
                        array_utf8.each do |num|
                                if num <= 0xFF
                                        array_enc << num
                                else
                                        # Numeric entity (&#nnnn;); shard by  Stefan Scholl
                                        array_enc.concat "&\##{num};".unpack('C*')
                                end
                        end
                        array_enc.pack('C*')
                end