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4.5. BNF for specific URL schemes Connected: An Internet Encyclopedia
4.5. BNF for specific URL schemes

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4.5. BNF for specific URL schemes

4.5. BNF for specific URL schemes

This is a BNF-like description of the Uniform Resource Locator syntax. A vertical line "|" indicates alternatives, and [brackets] indicate optional parts. Spaces are represented by the word "space", and the vertical line character by "vline". Single letters stand for single letters. All words of more than one letter below are entities described somewhere in this description.

The current IETF URI Working Group preference is for the prefixedurl production. (Nov 1993. July 93: url).

The "national" and "punctuation" characters do not appear in any productions and therefore may not appear in URLs.

The "afsaddress" is left in as historical note, but is not a url production.

  prefixedurl            u r l : url

  url                    httpaddress | ftpaddress | newsaddress |
                         nntpaddress | prosperoaddress | telnetaddress
                         | gopheraddress | waisaddress |
                         mailtoaddress  | midaddress | cidaddress

  scheme                 ialpha

  httpaddress            h t t p :   / / hostport [  / path ] [ ?
                         search ]

  ftpaddress             f t p : / / login / path [  ftptype ]

  afsaddress             a f s : / / cellname / path

  newsaddress            n e w s : groupart

  nntpaddress            n n t p : group /  digits

  midaddress             m i d  :  addr-spec

  cidaddress             c i d : content-identifier

  mailtoaddress          m a i l t o : xalphas @ hostname

  waisaddress            waisindex | waisdoc

  waisindex              w a i s : / / hostport / database [ ? search
                         ]

  waisdoc                w a i s : / / hostport / database / wtype  /
                         wpath

  wpath                  digits = path ;  [ wpath ]

  groupart               * | group | article

  group                  ialpha [ . group ]

  article                xalphas @ host

  database               xalphas

  wtype                  xalphas

  prosperoaddress        prosperolink

  prosperolink           p r o s p e r o : / / hostport / hsoname [ %
                         0 0 version [ attributes ] ]

  hsoname                path

  version                digits

  attributes             attribute [ attributes ]

  attribute              alphanums

  telnetaddress          t e l n e t : / / login

  gopheraddress          g o p h e r : / / hostport [/ gtype  [
                         gcommand ] ]

  login                  [ user [ : password ] @ ] hostport

  hostport               host [ : port ]

  host                   hostname | hostnumber

  ftptype                A formcode | E formcode | I | L digits

  formcode               N | T | C

  cellname               hostname

  hostname               ialpha [  .  hostname ]

  hostnumber             digits . digits . digits . digits

  port                   digits

  gcommand               path

  path                   void |  segment  [  / path ]

  segment                xpalphas

  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 ]

  alphanum               alpha | digit

  alphanums              alphanum [ alphanums ]

  void

   (end of URL BNF)


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Connected: An Internet Encyclopedia
4.5. BNF for specific URL schemes

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