("mailto") ; RFC1738 Electronic mail address
("news") ; RFC1738 Usenet news
("nntp") ; RFC1738 Usenet news using NNTP access
- ("propspero") ; RFC1738 Prospero Directory Service
+ ("prospero") ; RFC1738 Prospero Directory Service
("telnet") ; RFC1738 Telnet
("tftp") ; RFC2046 Trivial File Transfer Protocol
("url") ; RFC2017 URL scheme MIME access-type Protocol