[Zope] - isPrincipiaFolderish question

[Pavlos Christoforou]

Zopistas

<!--# if expr="foo.isPrincipiaFolderish"--> tests object foo.
How can I check the current object? 
I would like to have something like:

<!--# if expr="self.isPrincipiaFolderish"-->
I can hold stuff
<!--#/if-->
What is self in Zope?
And since Documents are methods wouldn't a call to
self.isPrincipiaFolderish check the parent folder and return true anyway?

Thanks

Pavlos