Host   = <host = [a-z]+ ("." [a-z]+)* > ;
Path   = <path = [a-z/.]* > ;
KeyVal = <key = [a-z]* > "=" <val = [a-z]* > ;
Query  = ${KeyVal} ("&" ${KeyVal} )* ;

URL    = "http://" ${Host} "/" ${Path} "?" ${Query} ;

// An example: "http://www.google.com/search?q=record&hl=en"