; FIXME:
 DQUOTE= %x22 ; " (Double Quote)
 
 
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 ; URI (2396) - ABNF
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 ;;;; 1.6. Syntax Notation and Common Elements
 alpha    = lowalpha / upalpha
 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"
 upalpha  = "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
 
 ;;;; 2. URI Characters and Escape Sequences
 urlc     = reserved / unreserved / escaped
 
 ;;;; 2.2. Reserved Characters
 reserved    = ";" / "/" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
 
 ;;;; 2.3. Unreserved Characters
 unreserved  = alphanum / mark
 mark        = "-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")"
 
 ;;;; 2.4.1. Escaped Encoding
 escaped    = "%" hex hex
 hex         = digit / "A" / "B" / "C" / "D" / "E" / "F" / "a" / "b" / "c" / "d" / "e" / "f"
 
 
 ;;;; 2.4.3. Excluded US-ASCII Characters
 control = %x00-1F / %x7F ;<US-ASCII coded characters 00-1F and 7F hexadecimal>
 space   = %x20 ;<US-ASCII coded character 20 hexadecimal>
 delims  = "<" / ">" / "#" / "%" / DQUOTE
 unwise  = "{" / "}" / "/" / "\" / "^" / "[" / "]" / "`"
 
 
 ;;;; 3. URI Syntactic Components
 absoluteURI   = scheme ":" ( hier-part / opaque-part )
 hier-part     = ( net-path / abs-path ) [ "?" query ]
 net-path      = "//" authority [ abs-path ]
 abs-path      = "/"  path-segments
 opaque-part   = urlc-no-slash *urlc
 urlc-no-slash = unreserved / escaped / ";" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
 
 ;;;; 3.1. Scheme Component
 scheme        = alpha *( alpha / digit / "+" / "-" / "." )
 
 ;;;; 3.2. Authority Component
 authority     = server / reg-name
 
 ;;;; Registry-based Naming Authority
 reg-name      = 1*( unreserved / escaped / "$" / "," / ";" / ":" / "@" / "&" / "=" / "+" )
 
 ;;;; 3.2.2. Server-based Naming Authority
 server        = [ [ userinfo "@" ] hostport ]
 userinfo      = *( unreserved / escaped / ";" / ":" / "&" / "=" / "+" / "$" / "," )
 hostport      = host [ ":" port ]
 host          = hostname / IPv4address
 hostname      = *( domainlabel "." ) toplabel [ "." ]
 domainlabel   = alphanum / alphanum *( alphanum / "-" ) alphanum
 toplabel      = alpha / alpha *( alphanum / "-" ) alphanum
 IPv4address   = 1*digit "." 1*digit "." 1*digit "." 1*digit
 port          = *digit
 
 ;;;; 3.3. Path Component
 path          = [ abs-path / opaque-part ]
 path-segments = segment *( "/" segment )
 segment       = *pchar *( ";" param )
 param         = *pchar
 pchar         = unreserved / escaped / ":" / "@" / "&" / "=" / "+" / "$" / ","
 
 ;;;; 3.4. Query Component
 query         = *urlc
 
 ;;;; 4. URI References
 URI-reference = [ absoluteURI / relativeURI ] [ "#" fragment ]
 
 
 ;;;; 4.1. Fragment Identifier
 fragment      = *urlc
 
 ;;;; 5. Relative URI References
 relativeURI   = ( net-path / abs-path / rel-path ) [ "?" query ]
 rel-path      = rel-segment [ abs-path ]
 rel-segment   = 1*( unreserved / escaped / ";" / "@" / "&" / "=" / "+" / "$" / "," )