Re: rap-sppi-02 EXTENDS clause instance mapping??

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

>>>>> Rawlins, Diana writes:

Diana> How is an EXTENDS instance related / associated with a specific
Diana> base instance? For example how is an instance of the
Diana> frwkIpFilterTable map to the appropriate instance of
Diana> frwkBaseFilterTable?

The instance of the frwkIpFilterTable and the appropriate instance of
the frwkBaseFilterTable share the same instance identifier. EXTENDS
basically works like AUGMENTS with the following difference: The
EXTENDS does not require that there is an instance in the extending
table for each instance in the base table. In other words, an AUGMENTS
is a 1:1 relationship while EXTENDS is an 1:0..1 relationship.

Diana> I'm not seeing any description of the mechanism associating an
Diana> extends instance and its base instance in the SPPI and/or the
Diana> Framework Policy Information Base draft -- maybe I'm seeing and
Diana> not understanding ;-)

I think section 8.8 of the latest SPPI draft contains the answers.

Diana> Also, can an EXTENDS PRC be specified as the base for another
Diana> EXTENDS PRC?

Yes. This is stated in the last sentence in the 2nd paragraph of
section 8.8 in the SPPI document.

/js

-- 
Juergen Schoenwaelder      Technical University Braunschweig
<schoenw@ibr.cs.tu-bs.de>  Dept. Operating Systems & Computer Networks
Phone: +49 531 391 3289    Bueltenweg 74/75, 38106 Braunschweig, Germany
Fax:   +49 531 391 5936    <URL:http://www.ibr.cs.tu-bs.de/~schoenw/>