[xwiki-users] Advise organising a wiki

Having played around with XWiki I'd like to deploy it within my organization, but I'm still a bit confused about what's possible at the different levels of granularity (wikis, spaces, pages) with respect to ACL, so I'd appreciate any advice anyone has to offer. I'd also unsure of global vs local users in the context of multiple wikis. I am in an organization that has multiple project teams. So consider this scenario for one team, called Team A: Some "Top Secret" areas should only be visible to members of Team A Some "Internal Secret" areas can be made available to members of other teams (Team B, say) Some "Shared Secret" areas can be shared with specific members Some "Public Info" areas can be made visible to all registered members What granularity can I provide the above levels. Would I need a separate wiki per team, with different spaces for each of the above areas, or could I have a single wiki with a space per team and different visibility per page? And does this visibility also apply to files attached to these pages?