Jean Jordaan writes:

.... further testing shows that this works::

<dtml-call "RESPONSE.redirect( DestinationURL()+'/manage_workspace')">

but this::

<dtml-if DestinationURL> <dtml-call "RESPONSE.redirect( DestinationURL()+'/manage_workspace')"> </dtml-if>

generates a::

Error Type: TypeError Error Value: call of non-function (type string)

I am not sure, but in the DTML User Guide I read that "dtml-if" is caching its variable (to save time, in case the variable is a costly method call). I would expect, it works as follows: like any DTML tag, "dtml-if" calls its name parameter (if it is callable). I expect that the result of this call is bound to the variable name. This means, "DestinationURL" which formerly was bound to a method, is now bound to the result of calling this method, i.e. to a string. Dieter