[Zope3-Users] Seeking Reference Guide on TAL/TALES/METAL

[mats.nordgren]

I think the answer to that question is both, but X['Y'] seem to have
precedents over X.Y.

class MyContainer(OOBTree):
    title=u''

class MyContent(Persistent):
    title=u''

Adding MyContent in MyContainer you can traverse MyContainer/MyContent/title
or you can traverse MyContainer/title equally well.  If I name MyContainer
'title' i get MyContent when I try MyContainer/title.

Sincerely,

Mats

On Fri, 31 Mar 2006 07:49:44 -0600, Jeff Rush wrote
> I've been searching and haven't managed to find the definitive 
> reference guide for the particular dialect of TAL/TALES/METAL that 
> is bundled with Zope 3.  There are various fragmentary and somewhat 
> divergent documents around and little about how the particular TALES 
> namespaces provided by Zope 3 work in complex cases.
> 
>   http://www.zope.org/Wikis/DevSite/Projects/ZPT/TAL%20Specification%201.4
> 
>   http://www.zope.org/Wikis/DevSite/Projects/ZPT/TALES%20Specification%201.3
> 
> There are no .txt ReST documents under the TAL and TALES source 
> directories, nor anything in the very nice ++APIDOC++ guide.
> 
> ---
> 
> My specific question is how evaluation of the path expression "X/Z" 
> is handled.  It *seems* to be:
> 
>      X.__getitem__('Y')    # X['Y']
> 
> whereas I'm trying to get:
> 
>      X.__getattr__('Y')    # X.Y
> 
> Under Zope 2, as I recall, it would try several algorithms; 
> attribute, mapping, sequence.  And I'm wondering if that mechanism 
> was simplified for Zope 3, and in what way.
> 
> -Jeff
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