Re: Significance of name forms.

Michael Ströder wrote: > Howard Chu wrote: >> Michael Ströder wrote: >>> On 2015-04-30 13:37, Howard Chu wrote: >>>> No. Name forms are only used when a DIT Structure Rule references >>>> them. >>> >>> Are you sure? If yes, then please point out what's missing herein: >> >> PS: you should read X.501(1993) for the exact text, since LDAP must >> conform to >> that spec. Section 12.6. >> >> http://www.itu.int/rec/T-REC-X.501/en > > Hmm... > > In X.501(1993) and X.501(2010) it is simply assumed that there are > *always* DIT structure rules. > > From X.501(1993) section 12.6.5 and X.501(2010) section 13.7.5: > "Each object and alias entry is governed by a single DIT structure rule" > > But there's no text dealing with the LDAP implementation without > governing structure rule of an entry. Name Forms are a component of DIT Structure Rules. If you don't use DIT Structure Rules, then you don't have name forms either. >>> http://www.stroeder.com/img/LDAP_Schema_References.png > > Also after re-reading X.501 it seems the diagram is correct. > > This statement in my former posting is obviously corrent: > > "You cannot use DIT Structure Rules without associated Name Forms." > > Because connecting the governing with the superior structural rule > cannot be done without name forms. > >>> The governing structure rule might limit the set of possible >>> structural >>> object classes in a part of a DIT but if absent or not applicable you >>> can still limit to possible name form(s) for a chosen structural >>> object >>> class. >> >> No, if there are no DIT structure rules then there are no constraints >> whatsoever on the naming or placement of entries. > > I did not find any text in X.501 or RFC 4512 which clearly says that. > Especially RFC 4512 makes DIT structure rules optional. Maybe I'm > missing something though. 12.6.2 A name form is only a primitive element of the full specification required to constrain the form of the DIT to that required by the administrative and naming authorities that determine the naming policies of a given region of the DIT. The remaining aspects of the specification of DIT structure are discussed in 12.6.5.