Hi Garito,

I saw in another thread you still need this. If I'm not wrong what you are pretending is to somehow render zpt on the fly. So, here is my idea:
I would like to write things like:

object.property = 'here/anotherproperty'
object.anotherproperty = 'Barcelona'

and ask it like:

print object.property -> 'Barcelona'


<tal:city tal:replace='here/property' /> -> 'Barcelona'

Is this possible?
I think you could perhaps create a new class to store the tal expression attributes, let's say you called it ExpressionAttribute. This class must be callable and be able to evaluate tal expressions. This is a small sketch of how I think it should look like:

from Products.PageTemplates.ZopeTemplate import ZopeTemplate

class ExpressionAttribute:
  #Here I also assume that you only enter the expressions
  #without html and the tal part, like: 'here/property'
  #Please also noticed that all sintax errors in your zpt
  #code must be catched somewhere
  def __init__(self, id, talExpr):
    self.talExpr = '<span tal:replace="%s"/>' % talExpr

    #I'm not sure about this, but I think it will create a Template on
    #the fly.
    self.zpt = ZopePageTemplate(id, text = self.talExpr)

  #Note: I really don't know if you have to pass other parameters to
  #pt_render, ie: the container of your property. You will have to test
  def __call__(self):
    return self.zpt.pt_render()

Then, in the __init__ of your zope product you will need to do things like this:

class YourProd(...):
  def __init__(self,prop1,prop2,prop3,...):
    #This is a normal property
    self.prop1 = prop1

    #This two are tal expression properties
    self.prop2 = ExpressionAttribute(prop1)
    self.prop3 = ExpressionAttribute(prop1)

Then, I guess you can call it as:
yourProdObj.prop3 or in tal: here/prop3

I'm not sure about what I wrote and if this is what you are looking for. I just hope it helps.

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