[Zope] dtml-if documentation

[Stephan Goeldi]

Can anybody point me to an advanced documentation of the dtml-if tag? The 
basic usage like

<dtml-if methoda>
  do this and that
</dtml-if>

is not enough. All found docs seem to stop at a certain point of the dtml-if 
description.

e.g. the "startswith" stuff, Oleg posted yesterday, was very helpful for me. 
Where is this documented?






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