RE: extending existing object classes vs deriving new classes

[Debasish Biswas <[e-mail]>]

Hi Luis,

I believe, using the first option (extending pre-defined standard object 
classes) will be a prferable option. As far as I know every real life 
DSA has a 'subschema' which consists of extended (subclassed) objects. 
Your new object classes and attributes will have to be registered with 
the 'attribute registry' attribute, 'object class registry' attribute and 
the 'name binding registry' attribute which will go in as attributes of 
the root DSE. As far as I know most of the commercial vendors provide XDS 
management extensions to allow access to these attributes.

I cannot say whether the vendors follow a standard mechanism to provide 
these extensions (thus making life simpler for an XDS/XOM based DUA 
developed using XDS library from Vendor A to continue working with a DSA 
from vendor B).

>Does anybody know about any other sources that talk about the
>new extensions to X.500 (1993) for schema support other than
>the X.500 document itself or Sara Radicati's X.500 book?

Another book that I have often consulted before :

    X.500 The Directory Standard and Its Applications - by Douglas Steedman
                  


Thanks.

Debasish Biswas
Directory Group
Worldtalk Corporation