An FAQ!
Ben Ocean writes:
> ...
> <dtml-if expr="sequence-item==0">
> ...
> I get an error that the compiler doesn't recognize the variable *sequence*.
Inside Python expressions (you explicitly write "expr=" to remind
yourself that you are using a Python expression!),
'-' is not part of a name but the operator minus...
Use
<dtml-if expr="_['sequence-item'] == 0">
Dieter