Hello,

I have arrived at the following ABNF for URN by combining RFC 2141 and
RFC 5234.  Can someone kindly let me know whether I got it right?

Thanks,
Gus

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URN            = "urn:" NID ":" NSS
NID            = LET-NUM [ 1*31LET-NUM-HYP ]
LET-NUM-HYP    = UPPER / LOWER / NUMBER / "-"
LET-NUM        = UPPER / LOWER / NUMBER
UPPER          = "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"
LOWER          = "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"
NUMBER         = "0" / "1" / "2" / "3" / "4" / "5" / "6" / "7" /
                 "8" / "9"
NSS            = 1*URNchars
URNchars       = TRANS / "%" HEX HEX
TRANS          = UPPER / LOWER / NUMBER / other / reserved
HEX            = NUMBER / "A" / "B" / "C" / "D" / "E" / "F" /
                 "a" / "b" / "c" / "d" / "e" / "f"
other          = "(" / ")" / "+" / "," / "-" / "." /
                 ":" / "=" / "@" / ";" / "$" /
                 "_" / "!" / "*" / "'"

On Apr 6, 6:25 pm, Generic Usenet Account <use...@sta.samsung.com>
wrote:

The ABNF spec RFC 5234 seems to define only the following "Core
Rules".  Are these adequate?

         ALPHA          =  %x41-5A / %x61-7A   ; A-Z / a-z

         BIT            =  "0" / "1"

         CHAR           =  %x01-7F
                                ; any 7-bit US-ASCII character,
                                ;  excluding NUL

         CR             =  %x0D
                                ; carriage return

         CRLF           =  CR LF
                                ; Internet standard newline

         CTL            =  %x00-1F / %x7F
                                ; controls

         DIGIT          =  %x30-39
                                ; 0-9

         DQUOTE         =  %x22
                                ; " (Double Quote)

         HEXDIG         =  DIGIT / "A" / "B" / "C" / "D" / "E" / "F"

         HTAB           =  %x09
                                ; horizontal tab

         LF             =  %x0A
                                ; linefeed

         LWSP           =  *(WSP / CRLF WSP)
                                ; Use of this linear-white-space rule
                                ;  permits lines containing only white
                                ;  space that are no longer legal in
                                ;  mail headers and have caused
                                ;  interoperability problems in other
                                ;  contexts.
                                ; Do not use when defining mail
                                ;  headers and use with caution in
                                ;  other contexts.

         OCTET          =  %x00-FF
                                ; 8 bits of data

         SP             =  %x20

         VCHAR          =  %x21-7E
                                ; visible (printing) characters

         WSP            =  SP / HTAB
                                ; white space

On Apr 6, 6:25 pm, Generic Usenet Account <use...@sta.samsung.com>
wrote:

Here's the complete ABNF.  Apologies for the previous posting, which
had some omissions:
URN            = "urn:" NID ":" NSS
                 ; Always starts with the string "urn:"

NID            = LET-NUM [ 1*31LET-NUM-HYP ]
                 ; Max length 31

LET-NUM-HYP    = UPPER / LOWER / NUMBER / "-"

LET-NUM        = UPPER / LOWER / NUMBER

UPPER          = "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"

LOWER          = "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"

NUMBER         = "0" / "1" / "2" / "3" / "4" / "5" / "6" / "7" /
                 "8" / "9"

NSS            = 1*URNchars

URNchars       = TRANS / "%" HEX HEX

TRANS          = UPPER / LOWER / NUMBER / OTHER / RESERVED

HEX            = NUMBER / "A" / "B" / "C" / "D" / "E" / "F" /
                 "a" / "b" / "c" / "d" / "e" / "f"

OTHER          = "(" / ")" / "+" / "," / "-" / "." /
                 ":" / "=" / "@" / ";" / "$" /
                 "_" / "!" / "*" / "'"

RESERVED       = '%" / "/" / "?" / "#"