[TYPO3-mvc] Backend category tree and extbase

[Dmitri Pisarev]

Hello list!
I have to start a new extbase project.
Let's take a general example: Article object and Tag object. Each 
Article can have many Tags assigned to it. And to complicate things a 
little, Tag should be a hierarchical object, so there should be a tree 
of Tags. Also in my BE module, I want to see this tree of Tags, and want 
it to behave like normal page tree in Typo3, so when I select some Tag I 
could see all of the Articles associated with it.

So, as I understand, there are two parts in this problem:
1) Implement a Tree model in extbase. Then let my Tags class inherit 
from it, right? Has anyone done it/thought of it?
2) Implement a backend module, that shall actually display the Tags tree 
to the left, and Articles to the right. I have never written BE modules, 
and this might should have been better posted to dev list, but as it's 
tied to extbase a lot, I have posted here.

Please share your experience! Some standardization is very important in 
this area, IMO, not to reinvent the wheel every time.

Cheers,
Dmitri.