All, I've just setup a test Zope installation. So far, very impressive. I'm using a Postgresql database containing a network hierarchy (basically, a table with a "network" column, and a "parentnet" column). I'm trying to display this with a tree view, using the following DTML: <dtml-let network="0/0"> <dtml-tree id=network branches_expr="network_children(parentnet=network)"> <b><dtml-var network></b> <dtml-var descr> </dtml-tree> </dtml-let> Where the network "0/0" is the pseudo-parent of every other network. The problem is, python (or DTML, I don't know) interprets this as a divide by zero, and it fails. The other alternative "0.0.0.0/0" also fails: Expression (Python) Syntax error: invalid syntax , for tag <dtml-let network="0.0.0.0/0">, on line 15 of test_html (I'm doing all this through the web management interface). I'm not familiar with Python (yet - the book is on it's way) but in the command-line interpreter, this works fine:

...

...

"0.0.0.0/0" '0.0.0.0/0' "0/0" '0/0'

I need to cast the value to dtml-let to a string. How? I know how to do this in Perl/C/Java/Pascal, but it's not obvious to me why this isn't working. Yours, dumbly.... Regards, Phil +----------------------------------+ | Phil Mayers, Network Support | | Centre for Computing Services | | Imperial College | +----------------------------------+