[Zope3-dev] Re: tal:define="..." considered harmful?

[Jean-Marc Orliaguet]

Tonico Strasser wrote:

> Hi Jean-Marc!
>
> I agree that a view should not be able to modify the data model. But I 
> think tal:define is a must have :)
>
> For example: I need tal:define to define names for generic macros:
>
> <ul tal:define="list main_navigation">
>   <li metal:use-macro="macros/li_repeat"/>
> </ul>
>
> The 'li_repeat' macro expects the name 'list'.
>
> Tonico


That's exactly what I'm saying: if templates did not try to create their 
own data layer, the 'li_repeat' macro could get the data from the model 
(instead it has to rely on cross-template communication)

that's an anti-pattern which is the consequence of having introduced 
tal:define. :-)

/JM