Re: [YANG] meaning of unique in PDUs

Martin Bjorklund píše v Pá 25. 01. 2008 v 13:44 +0100:
> Ladislav Lhotka <lhotka@cesnet.cz> wrote:
> > Phil Shafer píše v Čt 24. 01. 2008 v 22:11 -0500:
> > > >In some cases this mapping is automatic, some cases are defined in the
> > > >YANG draft and some are not clear yet (to me at least).
> > > 
> > > Please let me know where it isn't clear and we can fix the draft.
> > > 
> > Here is one: what's the interpretation (if any) of the unique statement
> > for PDUs?
> 
> The draft says:
> 
>   The "unique" statement is used to put constraints on valid
>   configurations. [...]

Yup, but Phil claimed:
YANG defines constraints on the XML that passes between the client and
server.

> 
>   In a valid configuration, the combined values of all the leaf
>   instances specified in the string MUST be unique within all list
>   entry instances.
> 
> Maybe we should be more clear what we mean with "valid configuration"?

Yes, there seem to be at least four different meanings.

> This isn't really a "unique" or "key" question; it is a datatype
> equestion.  In this case, the YANG built-in type "string" behaves as

Sure, but here it is quite crucial. Shouldn't YANG perhaps include a
built-in type equivalent to xs:token for these purposes?

> "xs:string", so no whitespace normalization is done.
> 

Lada

-- 
Ladislav Lhotka, CESNET
PGP Key ID: E74E8C0C

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