OmniGraffle Support

Hi, I'm interested in implementing Omni Applications in a new company
which uses a Mac environment that requires some compatibility with
non-MAC users and some repository tools we are about to implement.
 
Surfing the web, I've found some issues, comments and known problems
which I then checked in the release notes to see if they were already
fixed, but I was not able to find them.
 
Please, I'd like to know:

1.	Can OmniGraffle file format be saved in a repository system like
Subversion? See problem:
http://point.davidglasser.net/2006/07/30/using-omnigraffle-with-subversi
on-without-sadness/ 

2.	Can OmniGraffle file format be used and shared through a
Microsoft Sharepoint site, so many users can, one at a time, modify the
file and then publish it? 

3.	Can OmniGraffle file format be shared through a network shared
disk?

The problem is that if I'm not sure if this sharing capabilities are
supported, I will not be able to recommend Omni Apps to be purchased and
installed in this new company.
 
 
Thanks in advance.
 
Best regards.
 
Federico Rogoza