schema.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "definitions": {
        "B.B": {
            "properties": {
                "b": {
                }
            },
            "required": [
                "b"
            ],
            "additionalProperties": false,
            "type": "object"
        },
        "C.C": {
            "properties": {
                "c": {
                    "$ref": "#/definitions/B.B"
                }
            },
            "required": [
                "c"
            ],
            "additionalProperties": false,
            "type": "object"
        },
        "D.D": {
            "properties": {
                "d": {
                    "$ref": "#/definitions/C.C"
                }
            },
            "required": [
                "d"
            ],
            "additionalProperties": false,
            "type": "object"
        },
        "MyObject": {
            "$ref": "#/definitions/D.D"
        }
    },
    "$ref": "#/definitions/MyObject"
}