#ABNF 1.0 iso-8859-1;
mode voice;
language ;
tag-format <semantics/1.0>;
root $main;
public $main = {out=""} ($digit {out += rules.digit})<1->;
$digit= $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 |  $spec_char | $cifre;