Hi Philipp! Thank you so much for your response but in this lines is were the engine loads the possibilities but not were evaluate the current expression I would like to evaluate some condition before to load the class who resolves the expression (and witch is loaded in the code you point me) More clear? Thanks! 2008/8/11 Philipp von Weitershausen <philipp@weitershausen.de>

Garito wrote:

...

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

Products.PageTemplates.Expressions.createZopeEngine():

for pt in ZopePathExpr._default_type_names: e.registerType(pt, ZopePathExpr)

ZopePathExpr._default_type_names contains, among others, the name 'standard', which makes this expression type the default expression type.

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