Categorisation of ITEMs, Visibility vs Attached

Hi friends from community of UNA users...

Would it be very difficult to do multi-level categorization for modules: Albums, Photos, Videos Posts, ...

for example: 

Europe:              
----------France
-------------------Towns
-------------------Castles
-------------------Nature
-------------------Culture
----------Germany
-------------------Towns
-------------------Castles
-------------------Nature
-------------------Culture
----------Slovakia

This would be very very nice feature and i think very useful, may be necceessary

I believe that this would be very useful for many other users of your Software.

I want to create categorized (multi categorized) ITEM: post,video, article, photo, album, ....
that belong/is attached  to something (for instance) Group,  memebers they can add their oppinion, comments, ...

but the public users can to see some posts, read them, but can not add something ..oppinion. comments, ...
should be part of configuration of the item being created

We think. almost everything should be categorized, and can/should belong to samething but visible for some more another items..
again ...should be part of configuration of the item being created

There is example..:

Some goup of peole is organizing trip to some World location..
They create Group
-they plan you trips there
-they are discissing, private mailing, videochating there
- they are sharing photos, videos alpbus from a trip for a Group.... all together with people on the pictures ... this is private only in Group

but on other side
Some albums, Photos, where are popole not visible, those they Want to be attached to group, but visible to everybody ... PUBLIC...

You shoud understand ...
ONE thing is VISIBILITY
SECOND is Attached/Belong

In my opinion, this was a mistake by DOLPHIN and also now by UNA 

All the time I was hoping that this would change in the new UNA ...

Please reply you oppinion...

JURAJ
40 YEars of IT experience :-)