Re: [YANG] new pyang errors

Actually I am much more afraid that we will get complex, non-intuitive answers to these 
questions then what the answers really are.

I (Ericsson) personally live in a simple world. If you put something there it exists, if no it 
does not. So a default value exists as part of the config, it has effects. For us if a leaf 
does not exist in the config it has no effect whatsoever. We only use the default at creation 
time.

I hope whatever solution we settle on will not be much more complicated then that for any of 
the below 7 questions. As I see it with-defaults solves 1 problem from the below 7 that is 14%.

Balazs

Balazs Lengyel wrote:
> 
> Randy Presuhn wrote:
>> The "with-defaults" view sounds like it would help, particularly
>> if a default-ed value isn't known a priori.
> 
> Let's not forget that the handling of defaults effect much more then the 
> result of the get-config. IMHO the basic question is simply "does a leaf 
> set only due to it's default exist?" (in the conceptual database).
> 
> This effects the following:
> 1) Does it exist?
> 
> 2) How does edit-config create/delete work on it? E.g. can you create a 
> leaf that already exists(?) due to a default value?
> 
> 3) If you later explicitly delete a leaf with a default value what 
> happens. Will it cease to exist? Will it automatically pop-up with the 
> default value again?
> 
> 4) Is there any difference between a leaf set by the default and a leaf 
> explicitly (edit-config replace) set to the same value?
> I really hope not.
> 
> 5) Will get-config return such a leaf?
> It may or may not depending on the implementation or the with-defaults 
> option
> 
> 6) Will a non-presence container exist if it has leafs set by default? 
> This will effect how edit-config none is handled.
> 
> 7) Does a "must" statement consider such leafs to exist.
> I assume yes.
> 
> Balazs
> 
> 
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-- 
Balazs Lengyel                       Ericsson Hungary Ltd.
TSP System Manager
ECN: 831 7320                        Fax: +36 1 4377792
Tel: +36-1-437-7320     email: Balazs.Lengyel@ericsson.com

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