[Zope] Zope Acquisition Idiom

[Edmund Goppelt]

If I want to call another DTML method from within a DTML method, I use
the following Zope idiom:

My_dtml_method 

<dtml var fjdkjfkd>
higherup.folder.other_dtml_method(_.None, _)
.....

The docs says arg #1 is the client object I want the function to act
on and arg #2 a mapping like the REQUEST object.  So if I want the
function to act on my DTML object why the _.None idiom?  Why not refer
explicitly to my DTML object by using 'this' or PARENTS[0]?

-- 

Ed Goppelt