[mod_python] What is a directory?

From: "Gregory (Grisha) Trubetskoy" <grisha at modpython.org>

When InterpPerDirectory is On, the interpreter name would be based on the directory name extracted from req->filename.

So, I guess my question is how is the directory name "extracted" from 
req->filename?

Or to put it into more concrete terms, let me make a slight modification to the example in the link you provided:

For example, assume there is a /directory. /directory has an .htaccess file with a PythonHandler directive and InterpPerDirectory, but NO OTHER FILES.  Now suppose that apache is sent requests for:

	 (1) /directory/something
     (2) /directory/something.ext
     (3) /directory/something/something
     (4) /directory/something/something.ext
     (5) /directory/somethingelse
     (6) /directory/somethingelse.ext

Assuming that the python handler (via apache) sends some data back for all of these things.  Can you tell me which of these will share sub-interpreters and why?

Based on my preliminary observations it seems to me that only (1) and (4) end up sharing.  Would that make sense to you?

	Stefan