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On 13 Jul 2010, at 14:36, mohammed.ali.eng wrote:
it's depends on server,
It may seem that way but that's just the implementation. The
appropriate standards-setting docs would seem to be RDF1738 [1] and
later, for URIs, RFC3986 [2]. Both are clear about the character
content of http-urls / uris. Both provide descriptions in BNF, e.g.
this BNF fragment from RFC 1738 (where "urlpath" is the focus of our
interest) ...
urlpath = *xchar ; depends on protocol see section 3.1
[...]
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"
alpha = lowalpha | hialpha
digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" |
"8" | "9"
safe = "$" | "-" | "_" | "." | "+"
extra = "!" | "*" | "'" | "(" | ")" | ","
reserved = ";" | "/" | "?" | ":" | "@" | "&" | "="
hex = digit | "A" | "B" | "C" | "D" | "E" | "F" |
"a" | "b" | "c" | "d" | "e" | "f"
escape = "%" hex hex
unreserved = alpha | digit | safe | extra
xchar = unreserved | reserved | escape
(Read as: urlpath is "xchar" which, in turn, can be "unreserved",
which, in turn, can be "alpha", which, in turn, can be either
"lowalpha" or "hialpha")
[1] http://tools.ietf.org/html/rfc1738
[2] http://tools.ietf.org/html/rfc3986
- --
Cheers,
Graham
http://www.linkedin.com/in/ghiggins
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