[Zope] how does dtml-if evaluate REQUEST variables?

[Ulrich Wisser]

Hello,

when I try to evalute a REQUEST variable I get the following
behaviour:

<dtml-if entryid>

evalutes true when

http://server/dtml.doc?entryid=0

is called. I thought 0 would evaluate to false. How can
I tell dtml to evalute to false? 

Thanks

Ulli

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