Path-based authorization question

Hi,

I have two repositories created with svnadmin that I access via http/apache.

/var/repos/a
/var/repos/b

I am trying to prevent a user Z from having ANY access to /var/repos/a, but have
full access to /var/repos/b

I have created a svn_access_file with the content below. I have tried various
combinations, but I can either get user Z to read /var/repos/a or not to be able
to access any repository. I suspect I am just missing a subtle tweak. Can
anybody suggest how I can do this?

Thanks,

svn_access_file:

[groups]
full_users = X, Y
restricted_users = Z

[/]
@full_users = rw
@restricted_users =

[a:/a]
@full_users = rw
@restricted_users =

[b:/b]
@full_users = rw
@restricted_users = rw

-- 
Derek
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