Please post this question to the Parse::RecDescent mailing list.

recdescent at perl.org
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UPDATE: Reason being that I think there is more likelyhood that TheDamian or someone equally informed will reply there. Also its an interesting question that should go in the P::RD mailing list archives.

To whomever downvoted me on this: Get a life.

--- demerphq
my friends call me, usually because I'm late....