{
    "description": "Any validation failures are shown in the right-hand Messages pane.", 
    "type": "object", 
    "properties": {
        "foo": {
            "type": "number"
        }, 
        "bar": {
            "type": "string", 
            "enum": [
                "a", 
                "b", 
                "c"
            ]
        }
    }
}