[Zope] Difference between id and getId()?

[David Lambert]

I am a newbie to Zoip and apologize if this is a trivial question, but it has 
been giving me grief for several hours now.
I have found by experimentation that when iterating through a set of objects 
and testing their ids that the following only seems to work ONLY for folders:

<dtml-if "id == 'theObjectIdString'>
 ....
</dtml-if>

If however I use the code:

<dtml-if "getId() == 'theObjectIdString'>
...
</dtml-if>

all seems to work correctly. Obviously I am missing something very basic here.

TIA

Dave.