Re: [yang-doctors] Design pattern: Reusable types in type specific modules

Hi Ebben,

The client-server suite of drafts in NETCONF provide a number of general purpose modules that are expected to be used outside of the original purpose of defining a configuration model for NETCONF and RESTCONF servers.

My solution is to sprinkle if-feature statements everywhere so that implementations can easily turn off the parts they don’t want.   I hate deviations and hence hope this makes it so they’re unnecessary.

Hope it helps.

Kent

> On Feb 9, 2024, at 11:20 AM, Ebben Aries <exa=40juniper.net@dmarc.ietf.org> wrote:
> 
> YANG Doctors,
> 
> I'd like to understand if there has ever been motivation or guidance to
> model authors to question if any types (typedefs, identities or even
> groupings) they are bringing into domain specific work are to be
> used/leveraged outside of the scope of their immediate model work and if
> it's best to choose an alternate pattern to create domain specific types
> modules.
> 
> Outside of the obvious reusable global type modules (ietf-inet-types,
> ietf-yang-types, ietf-routing-types, etc..), there are many published
> modules that bring in reusable common types along side data-trees,
> notifications, rpcs, actions.
> 
> If another module wants to leverage any such types but the
> implementation may not support all other constructs, this is where the
> YANG library implement vs. import-only comes in however to a consumer,
> this is often not well understood or mandated for workflows.  Another
> solution here is to produce deviations which give another common
> misperception and perceived abuse that support is advertised for a model
> (or set of models due to sometimes vast dependency chains) then
> completely negated since only a small subset of a type is the
> dependency.
> 
> Where do we stand on this topic and have we been nudging any authors to
> question if their types should indeed get pulled back into specific
> domain/global types modules?
> 
> Thx
> 
> /ebben
> 
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