Re: [YANG] how to signal revision?

Ladislav Lhotka <lhotka@cesnet.cz> wrote:
> Hi,
> 
> how can the server and client make sure they are both using the same
> revision of a given data model? Capabilities in NETCONF hello messages
> use URIs but YANG draft says in sec. 5.4 that different revisions of the
> same module should have the same namespace.

The idea is that we use the uri query argument to indicate the
revision number (see 7.1.3):

   <capability>http://acme.example.com/system?2007-06-09</capability>

(I realize that the text should be clarified; probably move the
discussion about the capability from 7.1.3 to 5.4).

> Hmm, what could be the compatible changes, apart from correcting typos
> in descriptions etc.? I guess even changing a single default value
> renders the data model incompatible.

Yes, changing defaults is incompatible.  If you do that, you have to
change the namespace.

But there are many common compatible changes you can do, the simplest
is to add new optional data.

Note that the text describing this is not yet written in the draft.

/martin

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