Server Reference Guide : JSON-RPC 2.0 Interface : Returning Values to the Caller
 
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Returning Values to the Caller
According to the JSON-RPC 2.0 specification there is exactly one “result” value in the JSON response string. It can be a JSON object that can contain multiple members.
There are several ways to return values to the caller:
Return nothing
Using return values
Using a JsonValue
Defining BYREF parameters