[horde] Cannot add any permission

[Otto Stolz]

Hello,

I had written:
> I have logged in as a Horde administrator, and invoked the Permissions
> menu. There is only one entry, viz. "All Permissions".
> If I click on the little key icon next to it, I get the error message:
> "Invalid parent permission.", and nothing happens.

On 2007-01-02, Jan Schneider has written:
> Use Horde 3.1.3 where this has been fixed.

Thank you, Jan; that remark has saved my day! In spite of the open
questions (cf. infra), I have managed to render Turba's user inter-
face much more consistent and intuitive (e. g., Turba will no more
offer the user to modify our shop's e-mail directory, which can
only be searched).

Now, the question is: Where are the various permissions documented?
There is no such thing as a help text, and I have no idea where else
to look.

E. g.,
- what does "show" mean? (There is also a "read" permission;
   what is the difference?)
- Who is the "creator"? (Contrary to my expectations, I had to
   grant all authenticated users read/write access to the personal
   address books (dubbed »localsql«), so apparently no  user is
   considerered the creator of his own personal address book.)
- Apparently, »All Authenticated Users« really means »default
   rights«, i. e. these apply if no individual rights apply to
   a particular session. Is that conjecture correct?
- Apparently, revoking all rights for a user, or a group, will
   remove that user or group entirely from the data tree, effectively
   granting default rights to them. Is that observation correct?

Thanks for any enlightenment.

Best wishes,
   Otto Stolz