[netconf] What is the response structure when querying a specific instance object in a list?

[yuchaode <[e-mail]>]

Hello!
I have a question about the list node defined in Yang. When the key in the list is used to query a specific instance in the list, what should the return result be in json format ?
      Take the "example-jukebox" Yang Module in RFC 8040 A.1. as an example. The artist attribute is defined as list, and its key is name.. The artist list has two instances named Foo Fighters and Jack.
[cid:image001.jpg@01DA9014.46188A50] [cid:image002.jpg@01DA9014.46188A50]
What should the response structure look like when using a GET /restconf/data/example-jukebox:jukebox/library/artist=jack query?
{
  "example-jukebox:artist": [
    {
      "name": "jack",
      "album": []
    }
  ]
}
or
{
  "artist": {
    "name": "jack",
    "album": []
  }
}