Re: Question on <draft-bierman-ncx-smi-00.txt>

[Andy Bierman <ietf@andybierman.com>]

Bharadwaj Kalahasti wrote:
> Andy,
>   On page 8 of section 1.2, you have written:
> "
>    Although it is possible to arbitrarily extend the <appinfo> element,
>    this XSD mechanism is by definition non-standard, and 'off-the-shelf'
>    XSD-based applications will not be able to do anything useful with
>    information encoded in this manner.
> "
>   The stated flaws in XSD such as lack of conditional presence test for referential
> integrity could be fixed with changes to the XSD language by creating new elements
> that are test-only or such. Has there been effort in seeking such a solution from
> W3C forum so far?  Reason being an attempt to create a modeling language that is
> compliant with both SMIv2 and XSD seems to be an overkill. 

I think the 'must' and 'when' clauses in the YANG language address
the needs of NETCONF very well in this area.  They leverage Xpath
in the simplest possible way.

I don't know about a NETCONF DML that is backwards-compatible
with SMIv2.  I think YANG can represent just about any SMIv2
data model.  The reverse is obviously never going to be true.


>   Please enlighten me if I have missed any concepts here. 
> Thanks,
> Kalahasti

Andy


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