INTERNAL DRAFT 9 Common Gateway Interface – 1.1 25 July 2004
[rule]
An element enclosed in square brackets (‘[’ and ‘]’) is optional, and is equivalent to ‘*1 rule’.
N rule
A rule preceded by a decimal number represents exactly N occurrences of the rule. It is equivalent to ‘N*N
rule’.
2.2 Basic Rules
This specification uses a BNF-like grammar defined in terms of characters. Unlike many specifications which
define the bytes allowed by a protocol, here each literal in the grammar corresponds to the character it represents.
How these characters are represented in terms of bits and bytes within a a system are either system-defined or
specified in the particular context. The single exception is the rule ‘OCTET’, defined below.
The following rules are used throughout this specification to describe basic parsing constructs.
alpha = lowalpha | hialpha
lowalpha = "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"
hialpha = "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"
alphanum = alpha | digit
OCTET = <any 8-bit byte>
CHAR = alpha | digit | separator | "!" | "#" | "$" |
"%" | "&" | "’" | "*" | "+" | "-" | "." | "`" |
"ˆ" | "_" | "{" | "|" | "}" | "˜" | CTL
CTL = <any control character>
SP = <space character>
HT = <horizontal tab character>
NL = <newline>
LWSP = SP | HT | NL
separator = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" |
"\" | <"> | "/" | "[" | "]" | "?" | "=" | "{" |
"}" | SP | HT
token = 1*<any CHAR except CTLs or separators>
quoted-string = <"> *qdtext <">
qdtext = <any CHAR except <"> and CTLs but including LWSP>
TEXT = <any printable character>
Robinson & Coar Expires 23 January 2005 [Page 6]
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