The id of the cell the request was made in, this field may not be the empty string.
The id of the notebook document.
The request being answered.
The id is handed out per kernel, so it identifies a request only
together with the kernelId. It is a 64-bit integer, sent as a
string because it can exceed the range a JSON number represents
exactly.
The kernel that asked for the value.
A reply means something only to the kernel that asked for it, so a reply naming any other kernel is refused.
The value to give the kernel. Limited to 31KB to ensure it fits within SAFE host limits.
The input for ReplyEditorDocumentJupyterInputCommand.