[netmod] Proposal to enhance the YANG tree output

[Joe Clarke <[e-mail]>]

I've been hacking on pyang, and I changed tree.py to add the enum values
for enumeration types and identiyref bases for identityref types.  Here
is an example:

module: yang-catalog
    +--rw catalog
       +--rw modules
       |  +--rw module* [name revision organization]
       |     +--rw name                     yang:yang-identifier
       |     +--rw revision                 union
       |     +--rw organization             string
       |     +--rw ietf
       |     |  +--rw ietf-wg?   string
       |     +--rw namespace                inet:uri
       |     +--rw schema?                  inet:uri
       |     +--rw generated-from?          enumeration [mib, code,
not-applicable, native]
       |     +--rw maturity-level?          enumeration [ratified,
adopted, initial, not-applicable]
...
                               +--rw protocols
                               |  +--rw protocol* [name]
                               |     +--rw name
identityref -> protocol
...

My questions are:

1. Is this useful?

2. If so, can this be added to pyang (happy to submit a PR) and
draft-ietf-netmod-yang-tree-diagrams?

3. What changes to the output format would you recommend?

Thanks.

Joe