1{
2    "$schema": "http://json-schema.org/draft-07/schema#",
3    "type": "object",
4    "additionalProperties": false,
5    "required": [ "cancelled" ],
6    "properties": {
7	"cancelled": {
8	    "type": "string",
9	    "description": "A message indicating it was cancelled by RPC"
10	}
11    }
12}
13