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Re: [netmod] evaluation of "when" under NMDA

Balazs Lengyel <balazs.lengyel@ericsson.com> Tue, 05 December 2017 14:37 UTC

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To: Robert Wilton <rwilton@cisco.com>, Andy Bierman <andy@yumaworks.com>, Ladislav Lhotka <lhotka@nic.cz>
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From: Balazs Lengyel <balazs.lengyel@ericsson.com>
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Subject: Re: [netmod] evaluation of "when" under NMDA
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On 2017-12-05 11:04, Robert Wilton wrote:
I see your point now.
The server has to evaluate the when-stmts in operational.

I think that this is probably down to implementation, but I don't think that this is necessarily required.  A server is meant to conform to 'when' statements in <operational> (e.g. if the system is in a normal steady state), but they are allowed to be violated, and I'm not expecting that a server would evaluate them (except perhaps to discover implementation bugs).  Further, if violations of when statements in <operational> are detected then I don't think that there is anything that the server can reasonable do.
 
BALAZS: I always thought that if a when statement's argument was true but becomes false, all instance data that is set/written according to the schema nodes affected by the when statement shall be removed by the server.  So IMHO the server can and should do something about a violated when statement.

Actually I would like a list of statements and constraints that MUST be satisfied in the different data stores. Speaking about syntactic versus semantic seems fluffy.
-- 
Balazs Lengyel                       Ericsson Hungary Ltd.
Senior Specialist
Mobile: +36-70-330-7909              email: Balazs.Lengyel@ericsson.com

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