gistfile1.txt

{
  "type": "object",
  "properties": {
    "_type": {
          "enum": [ "cmd", "waypoint" ]
    },
    "action": {
      "default": "dump",
      "enum" : [
                        "reportLocation",
                        "reportSteps",
                        "dump",
                        "waypoints",
                        "clearWaypoints",
                        "setConfiguration",
                        "setWaypoints",
                        "action"
                ]
    },
    "content" : {
    	"type" : "string"
    },
    "url" : {
    	"type" : "string"
    },
    "notification" : {
    	"type" : "string"
    }
  },
  "if" : {
    "properties" : {
      "action" : { "const" : "action" }
    }
  },
  "then" : {
  "oneOf": [
    {
	
    	"required" : [ "content" ]
    },
    {
    	"required" : [ "url" ]
    },
    {
    	"required" : [ "notification" ]
    }
  ]
  }
}