We'll use branchcodes AAA and BBB for Libraries A and B.  Then we'll create patron types that we associate arbitrarily with those libraries:

AAA_Adult
BBB_Adult
AAA_Staff
BBB_Staff
AAA_Kid
BBB_Kid
BBB_Other

Now AAA sets circulation rules specifying for each BBB_* patron type that their checkout limit for default itemtype is 0.  BBB does the same for AAA_* types. 

Alternatively, they could define their own rules and make the rule for Default patron type be 0.  Then they don't have to create a new rule when BBB adds a patron type.  In that case, they have to be sure they defined all the ones they need though, and that their own user data is fully populated.  You can do this with or without IndependentBranches.

One hazard you might run into is if the membership rules allow users to get library cards at both institutions, then a user might have to get a bunch of cards as different versions of themself, and the true view of their activity will be fractured. 

--
Joe Atzberger
LibLime - Open Source Library Solutions

On Mon, May 4, 2009 at 11:33 PM, Henry Lam <henry@silas.org.sg> wrote:
Thank you Joe.
 
The setting I have in mind is: Several libraries form as a group. They share the same catalog and OPAC. But user from Library A cannot go to Library B to borrow items.  Please advise how to set the Circ rules and patron types.
 
Henry

On Thu, Apr 23, 2009 at 11:30 PM, Joe Atzberger <ohiocore@gmail.com> wrote:
SingleBranchMode won't help you here, since it expects that there is only a single library.  It sounds like what you want is just some structured Circ rules and patron types.

--
Joe Atzberger
LibLime - Open Source Library Solutions

On Thu, Apr 23, 2009 at 6:27 AM, Henry Lam <henry@silas.org.sg> wrote:
Hi

What is the difference between 'Independent Branches' &
'SingleBranchMode' in the System Preference Admin - Admin Preferences?

I am looking for something that restrict a patron borrow books from
other libraries in a same instance/setting.

Thank you for the help.

Regards
Henry