Hi I just submitted a new package to common-lisp.net called CL-ENUMERATION. It is a rendition of the Java Enumeration/Iterator interfaces in CL. It is essentially a way to let Java, C++, Python etc programmer migrate to CL. I would like to provide an ITERATE extension to leverage the ENUMERATION instances. I went through the manual but I am a little unclear about how to user DEFMACRO-DRIVER etc. Could anybody help me? Thanks Marco -- Marco Antoniotti http://bioinformatics.nyu.edu NYU Courant Bioinformatics Group tel. +1 - 212 - 998 3488 715 Broadway 10th FL fax. +1 - 212 - 998 3484 New York, NY, 10003, U.S.A.