[Zope] TALES expression

[Tino Wildenhain]

Fred Drake wrote:
> On Wed, Jul 16, 2008 at 6:34 AM, Tino Wildenhain <tino at wildenhain.de> wrote:
>> You should check the tales documentation. the pipe symbol |
>> means a logical "or", in effect if the left expression resolves
>> to "non existent", None, empty object,... (generally python False)
>> the right part of it is evaluated.
> 
> Not at all.
> 
> The pipe uses the left-hand operand if it is defined; a value of None
> or an empty string is still a defined value.  As long as "here" can be
> traversed with the name "getDataInici" then the left-hand expression
> will be used.  If that traversal fails the right-hand expression will
> be used instead.

Indeed :-)

Cheers
Tino
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