Fedora directory users - Jul 2006 - Question on Schema Object Class Inheritance

Hi,

I think I got the answer, but I would like to confirm that if I''m
correct.

At any given time, a single object class can only inherit from one and only
one object class (no multiple inheritance).

For example, if I have 3 object classes
1. objectclassA with attribute1
2. objectclassB with attribute2
3. objectclassC with attribute3
Then objectclassC can only either inherit from objectclassA or objectclassB.

If I want multiple inheirtance, then I''ll need the following setup
1. objectclassB inherits from objectclassA
2. objectclassC inheirts from objectclassB

If I am correct about the object class inheritance, so that means thdoes
this rule only apply on Fedora Directory Server or it applies to all other
LDAP-enabled directory servers?

Thanks!

David Chu

Chun Tat David Chu wrote:
> Hi,
> 
> I think I got the answer, but I would like to confirm that if I''m
correct.
> 
> At any given time, a single object class can only inherit from one and 
> only one object class (no multiple inheritance).
> 
> For example, if I have 3 object classes
> 1. objectclassA with attribute1
> 2. objectclassB with attribute2
> 3. objectclassC with attribute3
> Then objectclassC can only either inherit from objectclassA or
objectclassB.
Correct.

> If I want multiple inheirtance, then I''ll need the following setup
> 1. objectclassB inherits from objectclassA
> 2. objectclassC inheirts from objectclassB
No, it doesn''t work. Superior classes can only inherit from top.


Mike
-- 
http://www.netauth.com - LDAP Directory Consulting

Hi,

Chun Tat David Chu schrieb:
> At any given time, a single object class can only inherit from one and 
> only one object class (no multiple inheritance).
No. In the Tivoli IBM Directory Server an objectclass can inherit from 
multiple objectclasses.

Regards,
Dirk Kastens

Mike,
> If I want multiple inheirtance, then I''ll need the following setup
> 1. objectclassB inherits from objectclassA
> 2. objectclassC inheirts from objectclassB
>> No, it doesn''t work. Superior classes can only inherit from
top.
Um... That''s strange, because I''m able to do that.
Maybe my description is not clear?

If I have the following schema setup
1. objectClassA with attribute1 inherits from top
2. objectClassB with attribute2 inherits from objectClassA
3. objectClassC with attribute3 inherits from objectClassB
then I can achieve multiple schema object class inheritance.

objectClassC will contains attribute1, attribute2 and attribute3.

objectClassA is my superior class who inherits from top.

Am I correct?

Thanks,

David Chu



On 7/12/06, Mike Jackson <mj@sci.fi> wrote:
>
> Chun Tat David Chu wrote:
> > Hi,
> >
> > I think I got the answer, but I would like to confirm that if
I''m
> correct.
> >
> > At any given time, a single object class can only inherit from one and
> > only one object class (no multiple inheritance).
> >
> > For example, if I have 3 object classes
> > 1. objectclassA with attribute1
> > 2. objectclassB with attribute2
> > 3. objectclassC with attribute3
> > Then objectclassC can only either inherit from objectclassA or
> objectclassB.
>
> Correct.
>
>
> > If I want multiple inheirtance, then I''ll need the following
setup
> > 1. objectclassB inherits from objectclassA
> > 2. objectclassC inheirts from objectclassB
>
> No, it doesn''t work. Superior classes can only inherit from top.
>
>
> Mike
> --
> http://www.netauth.com - LDAP Directory Consulting
>
> --
> Fedora-directory-users mailing list
> Fedora-directory-users@redhat.com
> https://www.redhat.com/mailman/listinfo/fedora-directory-users
>

Chun Tat David Chu wrote:
> 
> Um... That''s strange, because I''m able to do that.
> Maybe my description is not clear?
> 
> If I have the following schema setup
> 1. objectClassA with attribute1 inherits from top
> 2. objectClassB with attribute2 inherits from objectClassA
> 3. objectClassC with attribute3 inherits from objectClassB
> then I can achieve multiple schema object class inheritance.
> 
> objectClassC will contains attribute1, attribute2 and attribute3.
> 
> objectClassA is my superior class who inherits from top.
> 
> Am I correct?
You''re correct. I was confused when I read your description. My bad.


BR,
Mike