The mapping for some existing standard
and experimental protocols is outlined
in the BNF syntax definition . Notes
on particular protocols follow. The
schemes covered are
- http
- Hypertext Transfer Protocol
- ftp
- File Transfer protocol
- gopher
- The Gopher protocol
- mailto
- Electronic mail address
- mid
- Message identifiers for electronic
mail
- cid
- Content identifiers for MIME
body part
- news
- Usenet news
- nntp
- Usenet news for local NNTP access
only
- prospero
- Access using the prospero
protocols
- telnet , rlogin and tn3270
- Reference
to interactive sessions
- wais
- Wide Area Information Servers
Other schemes may be specified by
future specifications
New schemes may be registered at
a later time.