RFC 1630                      URIs in WWW                      June 1994



  search                 xalphas [ + search ]

  user                   alphanum2 [ user ]

  password               alphanum2 [ password ]

  fragmentid             xalphas

  gtype                  xalpha

  alphanum2              alpha | digit | - | _ | . | +

  xalpha                 alpha | digit | safe | extra | escape

  xalphas                xalpha [ xalphas ]

  xpalpha                xalpha | +

  xpalphas               xpalpha [ xpalphas ]

  ialpha                 alpha [ xalphas ]

  alpha                  a | b | c | d | e | f | g | h | i | j | k |
                         l | m | n | o  | p | q | r | s | t | u | v |
                         w | x | y | z | A | B | C  | D | E | F | G |
                         H | I | J | K | L | M | N | O | P |  Q | R |
                         S | T | U | V | W | X | Y | Z

  digit                  0 |1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

  safe                   $ | - | _ | @ | . | &  | + | -

  extra                  ! | * |  " |  ' | ( | )  | ,

  reserved               =  |  ;  |  /  |  #  | ? |  : | space

  escape                 % hex hex

  hex                    digit | a | b | c | d | e | f | A | B | C |
                         D | E | F

  national               { | } | vline | [ | ] | \ | ^ | ~

  punctuation            < | >

  digits                 digit [ digits ]





 
RFC 1630                      URIs in WWW                      June 1994


  alphanum               alpha | digit

  alphanums              alphanum [ alphanums ]

  void

   (end of URL BNF)

References

  Alberti, R., et.al., "Notes on the Internet Gopher Protocol",
     University of Minnesota, December 1991,
     <ftp://boombox.micro.umn.edu/pub/gopher/ gopher_protocol>. See also
     <gopher://gopher.micro.umn.edu/00/Information About Gopher/About
     Gopher>

  Berners-Lee, T., "Hypertext Transfer Protocol (HTTP)", CERN, December
     1991, as updated from time to time,
     <ftp://info.cern.ch/pub/www/doc/http-spec.txt>

  Crocker, D., "Standard for ARPA Internet Text Messages" STD 11, RFC
     822, UDel, August 1982.

  Davis, F, et  al., "WAIS Interface Protocol: Prototype Functional
     Specification", Thinking Machines Corporation, April 23, 1990.
     <ftp://quake.think.com/pub/wa is/doc/protspec.txt>

  International Standards Organization, Information and Documentation -
     Search and Retrieve Application Protocol Specification for open
     Systems Interconnection, ISO-10163.

  Horton, M., and R. Adams, "Standard for Interchange of USENET
     messages", RFC 1036, AT&T Bell Laboratories, Center for Seismic
     Studies, December 1987.

  Huitema, C., "Naming: strategies and techniques", Computer Networks
     and ISDN Systems 23 (1991) 107-110.