[Data-modeling] About Freebase dump data and relation between two Types

[Nguyen Minh Tuan]

Hi all,
I have just studied in Freebase. The database is very interesting and, I 
hope my project can use it. I have got some question, I have search on 
http://www.freebase.com/discuss/hub, but have not yet found. So I post 
my questions in the maillist.
Firstly about Freebase dump data structure :
- The next time you export your new dump data is when ?
- I downloaded your dump data, there is many folder and file, and I do 
not really understand its structure :
    + Does each folder correspond to a domain ?
    + Does each domain correspong to a folder ? :D that is two different 
questions, I mean 1-1 correspondance.
    + Does files correspond to a type ?
    + Does a type correspond to a file ?
    
Secondly, Is there inheritance relation between two Types ? Because I 
found that almost folders in dump date have not any sub folder, instead 
of the "base" folder.

Thirdly, should I post my question in the mailling list OR on the 
discussion on the web site. ?

And finally, how can I search on old questions on the mailling list ?

I am looking forward for your answers. Thanks in advance.
Tuan