Thank you; Indeed I find the %MY:: pseudo-class mentionned at Apocalypse 2 -Names, used in the Apocalypse 4 page 3 and discussed in Perl6-language but I fail to see how it solves the issues I described in my nodelet and the pages it links to. Also opening the interactive biotop to Perl is well worth a special feature if standard ones don't cut it without mentionning the utility of an interactive Perl as a training device.

-- stefp -- check out TeXmacs wiki