URL Schemes
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Uniform Resource Locators (URL) Schemes
In the Uniform Resource Locators (URL) definition [RFC2396,RFC1738]
there is a field, called "scheme", to identify the type of resource
and access method.
Scheme Name     Description                                    Reference
-----------     -----------------------------------------      ---------
ftp             File Transfer Protocol                         [RFC1738]
http            Hypertext Transfer Protocol                    [RFC2068]
gopher          The Gopher Protocol                            [RFC1738]
mailto          Electronic mail address                        [RFC2368]
news            USENET news                                    [RFC1738]
nntp            USENET news using NNTP access                  [RFC1738]
telnet          Reference to interactive sessions              [RFC1738]
wais            Wide Area Information Servers                  [RFC1738]
file            Host-specific file names                       [RFC1738]
prospero        Prospero Directory Service                     [RFC1738]
z39.50s         Z39.50 Session                                 [RFC2056]
z39.50r         Z39.50 Retrieval                               [RFC2056]
cid             content identifier                             [RFC2392]
mid             message identifier                             [RFC2392]
vemmi           versatile multimedia interface                 [RFC2122]
service         service location                               [RFC2609]
imap            internet message access protocol               [RFC2192]
nfs             network file system protocol                   [RFC2224]
acap            application configuration access protocol      [RFC2244]
rtsp            real time streaming protocol                   [RFC2326]
tip             Transaction Internet Protocol                  [RFC2371] 
pop             Post Office Protocol v3                        [RFC2384]
data            data                                           [RFC2397]
dav             dav                                            [RFC2518]
opaquelocktoken opaquelocktoken                                [RFC2518]
sip             session initiation protocol                    [RFC2543]
tel             telephone                                      [RFC2806]
fax             fax                                            [RFC2806]
modem           modem                                          [RFC2806]
Reserved URL Scheme Names:
   afs              Andrew File System global file names
   tn3270           Interactive 3270 emulation sessions
   mailserver       Access to data available from mail servers
REFERENCES
[RFC1738] Berners-Lee, T., L. Masinter, and M. McCahill, "Uniform
          Resource Locators (URL)", RFC 1738, CERN, Xerox Corporation,
          University of Minnesota, December 1994.
[RFC2056] Denenberg, R., J. Kunze, D. Lynch, "Uniform Resource
          Locators for Z39.50", RFC 2056, Library of Congress,
          University of California, San Francisco, SilverPlatter
          Information Ltd., November 1996.
[RFC2068] Fielding, R., et. al., "Hypertext Transfer Protocol --
	  HTTP/1.1", RFC 2068, January 1997.
[RFC2122] Mavrakis, D., H. Layec, and K. Kartmann, "VEMMI URL
          Specification", RFC 2122, Monaco Telematique, ETSI,
          Telecommunication+Multimedia, March 1997.
[RFC2165] Veizades, J., E. Guttman, C. Perkins, and A. Kaplan,
          "Service Location Protocol", RFC 2165, @Home Network, Sun
          Microsystems, June 1997.
[RFC2192] Newman, C., "IMAP URL Scheme", RFC 2192, Innosoft, September
          1997.
[RFC2224] Callaghan, B., "NFS URL Scheme", RFC 2224, Sun Microsystems,
          October 1997.
[RFC2244] Newman, C., and J. Myers, "ACAP -- Application Configuration
          Access Protocol", RFC 2244, Innosoft, Netscape, November
          1997.
[RFC2326] Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time
          Streaming Protocol (RTSP)", RFC 2326, Columbia U., Netscape,
          RealNetworks, April 1998.
     
[RFC2368] Hoffman, P., Masinter, L., and J. Zawinski, "The mailto URL
          scheme", RFC 2368, July 1998.
[RFC2371] Lyon, J., Evans, K., and J. Klein, "Transaction Internet
          Protocol Version 3.0", RFC 2371, July 1998.
[RFC2384] Gellens, R., "POP URL Scheme", RFC 2384, Qualcomm Inc.,
          August 1998.
[RFC2392] Levinson, E., "Content-ID and Message-ID Uniform Resource
          Locators", RFC 2392, XIson Inc, August 1998.
[RFC2396] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
          Resource Identifiers (URI): Generic Syntax", RFC 2396,
          August 1998.
[RFC2397] Masinter, L., "The "data" URL scheme", RFC 2397, August
          1998.     
[RFC2518] Goland, Y., Whitehead, E., Faizi, A., Carter, S. and
          D. Jensen, "HTTP Extensions for Distributed Authoring --
          WEBDAV", RFC 2518, February 1999.
[RFC2543] Handley, M., Schulzrinne, H., Schooler, E. and J. Rosenberg,
          "SIP: Session Initiation Protocol", RFC 2543, March 1999.
[RFC2609] Guttman, E., Perkins, C., Kempf J., "Service Templates and
          Service: Schemes", RFC 2609, June 1999.

[RFC2806] Vaha-Sipila, A., "URLs for Telephone Calls", RFC 2806,
          April 2000.
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