{
    "$schema": "http://json-schema.org/draft-07/schema",
    "title": "Schema containing a single-element allOf",
    "description": "Schema containing a single-element allOf",
    "definitions": {
        "my_reference": {
            "type": "string",
            "description": "My string definition"
        }
    },
    "allOf": [
        {
            "$ref": "#/definitions/my_reference"
        }
    ]
}