Re: [yang-doctors] question regarding conditional/optional statements

[Juergen Schoenwaelder <[e-mail]>]

On Wed, Aug 16, 2017 at 06:09:27PM +0000, Ing-Wher Chen wrote:
> Hello YANG doctors,
> 
> We wish to define a YANG model with several counters.  The counters that we wish to model are the union of all the counters supported by our sample of vendors.  This means that the model will define some counters supported by both vendor_1 and vendor_2 (or more), but some counters will be supported only by one of the vendors.  We would like the model to allow each vendor to indicate the counters it supports.
> 
> We can think of 3 approaches below, and would like your feedback regarding which approach we should choose.  We're also open to suggestions of other approaches.
> 
> Option 1: Define an optional feature (if-feature) for each counter.
> 
> Option 2: Define a leaf of the type bits, where each bit indicates that a particular counter is supported.
> 
> Option 3: Define a leaf of the type integer, where each bit in the integer indicates that a particular counter is supported.
> 

Let me add:

Option 4: Vendors publish deviations that document how they deviate from
the standard.

Advantage: This is the standard approach built into the language to document
how an implementation deviates from a standard.

Disadvantage: Vendors do not like to document deviations, hence they
like to see every little counter as a feature.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
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