You could use ElementTree for XML. Or just use nested dictionaries. -T John Nagle wrote: > Delaney, Timothy (Tim) wrote: > > vertigo wrote: > > > > > >>Hello > >> > >>What library/functions/classes could i use to create trees ? > > SpeedTree, of course. > > http://www.speedtree.com > > They have great downloadable demos. > > John Nagle