[netmod] <get-data> operation with "table join" capability

[Xufeng Liu <[e-mail]>]

During the modeling discussion within TEAS WG, we encountered the dilemma
between more compact (with less or no redundant information) YANG structure
and less <get-data> operations. We are wondering if it is reasonable to
request NETCONF/YANG to support <get-data> operations with "table join"
capability that is equivalent to the SQL "JOIN" statement.

The issue is reported as the last section in
https://github.com/tsaad-dev/te/issues/98.

The desired capability is:

When a leafref or multiple leafrefs reference one or more objects specified
in other parts of the schema, the operator can use a single <get-data>
operation to retrieve all attributes of the object containing the leafref
and the attributes referenced by the leafref statement.

Thanks,
- Xufeng