[Zope] How do I check for existence of a page?

[Dieter Maurer]

Joel Burton writes:
 > On Wed, 28 Feb 2001, Dieter Maurer wrote:
 > >   I many cases, you can use
 > > 
 > >     <dtml-if "_.hasattr(aq_explicit,'attrname')">
 > > 
 > >   or
 > > 
 > >     <dtml-if "_.hasattr(object.aq_explicit,'attrname')">
 > > 
 > >   to check whether the current object or "object", respectively,
 > >   has attribute "attrname".
 > > 
 > > 
 > >   In some rare cases, this can give you a "true" result,
 > >   even though the object does not have an 'attrname'.
 > 
 > To help me understand Zope better (!), what are the 'rare cases' where
 > this would give a false positive?
That is difficult to explain.

Search the (searchable) list archive for a post from
me titled "unexpected acquisition behavior" (or something similar).


Dieter