Re: Are subordinate or NSSR references mandatory?
D.W.Chadwick@iti.salford.ac.uk Fri, 10 November 1995 04:51 UTC
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Date: 9 Nov 95 18:33
Subject: Re: Are subordinate or NSSR references mandatory?
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Date: Thu, 09 Nov 95 09:20:43 EST From: Robert Adelberg <adelberr@FHU.DISA.MIL> Message-Id: <9510098159.AA815945809@FHU.DISA.MIL> To: firstname.lastname@example.org, email@example.com Subject: Are subordinate or NSSR references mandatory? Have a question regarding references. Fred and I at the JITC are preparing to revise the X.500 PICS (hopefully) for the last time and have come across some ambiguity in the base standard. Long story It all started with the conformance requirement for minimum knowledge, X.519, clause 9.2.2c. "A DSA shall conform to the minimal knowledge requirements defined in ITU-T Rec. X.518 | ISO/IEC 9594-4;". BTW, Minimum knowledge requirements are actually defined in X.501, clause 18.4 (unless there is a difference between minimal knowledge and minimum knowledge.) The question is our interpretation of the minimum knowledge specified in 18.4.1 - 18.4.4. 18.4.1 Superior Knowledge - If the DSA is not a first-level DSA, superior references are mandatory. 18.4.3 Supplier Knowledge - If the DSA consumes, supplier references are mandatory. 18.4.4 Consumer Knowledge - If the DSA supplies, consumer references are mandatory. Finally, 18.4.2 Subordinate knowledge - "A DSA that is the master DSA of a naming context shall maintain subordinate or non-specific subordinate references of category master knowledge to each master DSA holding (as master) an immediately subordinate naming context." Are we to assume that this translates into: If the DSA is not a centralized (solitary) DSA the subordinate OR non-specific subordinate reference are mandatory? ----------------- YES. A centralised DSA does not have any immediately subordinate naming contexts and therefore does not need to hold any subordinate references Centralized DSA is define in the PICS to be: a DSA that is not capable of holding knowledge information about other DSAs. ---------------- Wrong definition in my opinion. A centralised DSA is a DSA that holds the entire DIT (from its perspective) i.e. no other DSAs exist (from its perspective). And another thing, there is no ASN.1 definition for subordinate knowledge as we assume it is some conglomeration of specific and non-specific knowledge. ------------- The definitions of knowledge references are in Part 2, clause 20.2.1.n (3 and 4 for subr and NSSR) David Chadwick Editor Part 4 That is our interpretation, any comments on this would be appreciated. Rob Adelberg OSE Lab, JITC Ft. Huachuca, AZ USA