[Zope] Page Template help

[Garito]

Hi!
Could someone point me where the page template code decide if an expression
is a path expression or a string or python one, please?

I'm studying the zope page template classes and I would like to understand
where this decision is taken

Thank you so much!

-- 
Mis Cosas
http://blogs.sistes.net/Garito
Zope Smart Manager
http://blogs.sistes.net/Garito/670
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