{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "properties": {
        "string": {
            "type": "string",
            "default": ""
        },
        "object": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "numA": {
                    "type": "number",
                    "default": 0
                },
                "numB": {
                    "type": "number",
                    "default": 0
                }
            },
            "required": [
                "numA"
            ]
        }
    }
}