What is {Key} and (Value) in registry get {Key} (Value) command. and how to get it. Please help

[#1]

What is {Key} and (Value) in "registry get {Key} (Value)" command on DataOntap 8.X. and how to get it.?

Please help.

Thanks in advance.

[#2]

the registry is a file containing opions in key=value format  wild guess, that api call returns the value associated with a key.