[netmod] Schema Mount Point Instance Yang Library Clarification

[Rohit R Ranade <[e-mail]>]

Hi All,

In https://tools.ietf.org/html/rfc8528#section-4, a below example is shown for parent references,

"
     +--rw interfaces
     |  +--rw interface* [name]
     |     ...
     +--rw network-instances
        +--rw network-instance* [name]
           +--rw name
           +--mp root
              +--rw routing
                 ...

"
Consider a simple case where the ietf-routing module and ietf-ospf module are mounted as part of network-instance of a L3vpn. Also consider that for ietf-ospf , it has some interface configuration as shown below.
This needs parent-references , since the interface configuration is in the parent data-tree of mount-point.

module: ietf-ospf
   augment /rt:routing/rt:control-plane-protocols/
            rt:control-plane-protocol:
     +--rw ospf
        +--rw areas
        |  +--rw area* [area-id]
        |     +--rw interfaces
        |        +--rw interface* [name]
        |           +--rw name     if:interface-ref

Since the YANG library "under" the mount-point-instance has to be complete, I was thinking that the YANG library under the mount-point will have the "ietf-interfaces" YANG module. Since the "ietf-interfaces" module under the network-instance mount-point may not make sense,  the "conformance-type" for it will be "import" instead of "implement".

Another statement though confuses me , where the argument of  "presence" statement of "shared-schema",
""The mounted schema together with the 'parent-reference'
                make up the schema for this mount point.";"  ==> Does this mean that YANG Library of the mount-point-instance should not have "ietf-interfaces" in this case ? This may make the client work complicated.


With Regards,
Rohit