[Zope] Parameters for external methods and page templates

[Andreas Tille]

Hello,

I'm quiet happy with the example of using External Methods with PIL
which can be found at

     http://www.zopelabs.com/cookbook/1010702887

I can perfectly call this method using

      <img src="tumb?width=42&height=42">

and get an thumbnail in the size I want it to be. Remark:  I had to
use a default image name (see below) because I did not found out
the correct syntax for specifying an image name.

On the other hand I would like to use this external method with pages
templates and I failed while having no clue to specify the parameters.s
The problem is the first parameter

      def MakeThumbHi2(self, image="bland.gif", width, height):
                       ^^^^

self.  I really have no idea how to put this into the correct
syntax from page templates.

When reading the Zope Book I noticed that the examples are exclusively
realized using Python Scripts and these are glued in a DTML document.
Is this the only way to go here to avoid the problem of specifying
the "self" argument and arguments of type string?

Kind regards

         Andreas.