[ZPT] Re: xpath: expression type?

[Chris Withers]

Paul Everitt wrote:
> 
> No, I just meant that I'm not subscribed to the zpt list.  So, I  would 
> have replied to all, there would have been a bounce.

Oh well, I shall bounce away then... ;-)

>>> Indeed, that was kind of the direction I was going towards.  I've   
>>> been told that ZPT in Zope 3 is more pluggable, giving various   
>>> opportunities to register things that get evaluated inside TALES  at  
>>> different hops.  (For example, traversal on path expressions  or  
>>> whatnot.)
>>>
>>
>> *nods* well, I'd imagine plugging in a new expression type isn't  too 
>> hard, no matter what TALES implementation is used...
>>
>>
>>> One thing is missing, though, from what you have below: a way to  
>>> bind  to the Python variable holding the node.  Let's say that it  is 
>>> "here"  that is the node that we are operating on.  You need to  say 
>>> something  more like:
>>> tal:repeat="thisvendor xpath: here //vendor[@status='approved']/ title"
>>> Is that possible?
>>>
>>
>> Hey, it's out expression type, we can use whatever syntax we want ;-)
>>
>> Now, I guess whatever "here" is above needs to support an xpath  
>> traversal. I guess in Zope 3 we'd check for an "xpath interface" on  
>> "here" and raise an exception if it didn't support it?
> 
> 
> Yup.
> 
>> (see, I can hand wave too ;-) )
> 
> 
> Listen, I"m Mr. Hand Wave. :^)  My talent is limited to partially  
> understanding this email, with zero idea how to do it.

Yeah yeah...

cheers,

Chris

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