HT writes: > it works. > I thtink, I don't find such usage of ( "_[pg]") in the zopebook. Probably, you did not read carefully enough (see the DTML namespace). > Where can I find such documentation? You will find something also in the "Name lookup" section of <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html> Dieter