to_us_ascii (REXML::Encoding)

    # 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