url.rewrite                 = ( "^/[:alnum:]$"    => "/?lang=$1" )
  url.rewrite                 = ( "^/[:alnum:]/[:alnum:]$"    => "/?lang=$1&perspective=$2" )
  url.rewrite                 = ( "^/[:alnum:]/[:alnum:]/[:alnum:]$" => "/?lang=$1&perspective=$2&document=$3" )
  url.rewrite                 = ( "^/[:alnum:]/[:alnum:]/[:alnum:]/[:alnum:]$" => "/?lang=$1&perspective=$2&document=$3&comment=$4" )