<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/4.2.2"> </HEAD> <BODY> Thansk for the answer, I didn't notice this part of the doc. In fact the (make-hasheq) doesn't fit because the objects needs to be inspect with equal? to find a match. It seems it is not possible this way, as writted in the doc. Thanks anyway. <BLOCKQUOTE TYPE=CITE> <PRE>