{
    "types": [
        {
            "id": ["keys", "X"],
            "kind": "record",
            "fields": [
                {"name": "a", "value": {"kind": "string"}, "required": true},
                {"name": "b", "value": {"kind": "boolean"}, "required": true}
            ]
        },
        {
            "id": ["keys", "Y"],
            "kind": "union",
            "variants": [
                {"kind": "literal", "value": "a"},
                {"kind": "literal", "value": "b"}
            ]
        }
    ]
}