Martin:

Does this mean if the I2RS model provides additional functions that are not
a base configuration model that the xpath should just work? 

Xpath1- Config - ISIS Yang model that configures 
Xpath2 - I2RS ISIS  empheral - inherits all the configuration state 
____       I2RS ISIS actions -     report on the interface changes on ISIS
L1 interfaces

Is my I2RS ISIS model a combination of the inherited state and the I2RS
actions? 

Sue 


-----Original Message-----
From: i2rs [mailto:[email protected]] On Behalf Of Martin Bjorklund
Sent: Wednesday, September 24, 2014 3:27 AM
To: [email protected]
Cc: [email protected]; [email protected]; [email protected]
Subject: Re: [i2rs] [netmod] Summary of discussion from netmod interim on
i2rs requirements on netmod/netconf

Juergen Schoenwaelder <[email protected]> wrote:
> On Mon, Sep 22, 2014 at 05:05:46PM -0400, Jeffrey Haas wrote:
> > Some discussion was given to the filtering considerations.  
> > Extending the filtering options of the ietf-inet-types module may be
appropriate.
> > [Juergen, is this an action item for yang 1.1?]
> 
> The YANG 1.1 issue Y20 is about adding a set of built-in xpath 
> functions. I like to ask I2RS to tell us what functions they need. We 
> do have IP prefix-length matching on our radar. If other functions are 
> required, please let us know as soon as possible.
> 
> Now, this mostly is about the xpath function set that can be used in 
> must and when expressions. You probably want to use them also in 
> filtering expressions in the protocol. This is where things again 
> become a protocol issues. Note that RFC 6241 says on page 17:
> 
>       The XPath expression is interpreted in the following context:
> 
>       [...]
> 
>       *  The function library is the core function library.

The quoted text is for the error-path.  For the filter, rfc 6241 says (p
67):

   o  The function library is the core function library, plus any
      functions defined by the data model.


/martin

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