* A typical call is: show @datamodel:example, cli_show_auto("candidate", "json");
* The example contains a more elaborate example.
* Thanks ngashok for request, see https://github.com/clicon/clixon/issues/24
* Previous support did no validation of values.
* Validation of types and CLI expansion
* Example extended with inclusion of iana-if-type RFC 7224 interface identities