I've just tried an new (last) version of XOTcl and get an amount of my XOTcl code errors, that there isn't such function as cset!.
In http://media.wu-wien.ac.at/doc/ChangeLog I saw:
2001-09-16 Uwe Zdun uwe.zdun@uni-essen.de ... - eliminated "cset" on Object and from the distribution, seems to be nearly unused
...
How did you estimate the unuseness!? :))
On my mind, it was very usefull one,,, at last for me...
thanks, Andriy.