additionalProperties.json

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Standing instance",
    "type": "object",
    "required": ["positions"],
    "properties": {
        "positions": {
            "anyOf": [
                { "type": "integer", "maximum": 20, "description": "this is a desc"},
                { "type": "boolean", "description": "this is a desc" }]
        }
    },
    "additionalProperties": {
        "anyOf": [
            { "type": "integer", "maximum": 20},
            { "type": "boolean" },
            { "type": "string", "maxLength": 5},
            {
                "type": "array",
                "minItems": 1,
                "items": {
                    "type": "object",
                    "required": ["key"],
                    "additionalProperties": false,
                    "properties": {
                        "key": {
                            "type": "integer", "description": "this is a desc"
                        }
                    }
                }
            },
            {
                "type": "object",
                "description": "Docson is able to visualize it",
                "properties": {
                    "id": {
                        "description": "The unique identifier for a product",
                        "type": "number"
                    },
                    "name": {
                        "type": "string"
                    }
                },
                "additionalProperties": false
            }
        ]
    }
}