Re: sppi - PolicyTagReference - zero means what?

[Juergen Schoenwaelder <schoenw@ibr.cs.tu-bs.de>]

>>>>> Man M Li writes:

Man> It is not stated explicitly, but can one assign zero to
Man> PolicyTagReference to indicate that it is not currently pointing
Man> to any tag list? (Similar as that defined for PolicyReferenceId)

You should look at the latest version of the SPPI definition in
draft-ietf-rap-sppi-02.txt which is much clearer about this:

: ReferenceId ::= TEXTUAL-CONVENTION
:     STATUS       current
:     DESCRIPTION
:         "A textual convention for use by an attribute which is used as
:         a pointer in order to reference an instance of a particular
:         PRC.  An attribute with this syntax must not be used in a
:         PIB-INDEX clause , and its description must specify the
:         particular PRC to which the referenced PRI will belong.
:         For an attribute of this type, the referenced PRI must exist.
:         Furthermore, it is an error to try to delete a PRI that is
:         referenced by another instance without first deleting/modifying
:         the referencing instance.  The definition of an attribute with
:         this syntax can permit the attribute to have a value of zero to
:         indicate that it is not currently pointing to an PRI."
:     SYNTAX       Unsigned32

Note that PolicyReferenceId got renamed to ReferenceId and this is why
I know that you are reading an old SPPI document. ;-)

/js

-- 
Juergen Schoenwaelder      Technical University Braunschweig
<schoenw@ibr.cs.tu-bs.de>  Dept. Operating Systems & Computer Networks
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