Slide 7
Slide 7 text
ASCII control characters
• Many are now obsolete, but stem from telegraph (and printer) days 🖨
• XML disallows control characters other than CR, LF, HT␍ ␊␉
• Some were used for printer control mechanisms
• HT or VT – horizontal or vertical tab (^I or ^K) ␉␋
• LF or FF – line feed or form feed (^J or ^L) ␊␌
• CR – carriage return (^M) ␍
• Some are used for noti
fi
cation
• BEL – ring the bell (^G is beep in Unix terminals) ␇
• Some were used for noti
fi
cation
• ACK – acknowledge ␆, NAK – negative ␕, STX or ETX – start or end of text ␂␃
• ESC – escape ␛, SYN – synchronous idle, NUL