{
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "allOf": [{ "$ref": "#/$defs/Catalog" }],
    "$defs": {
        "Catalog": {
            "type": "array",
            "items": { "$ref": "#/$defs/Dataset" }
        },
        "Dataset": {
            "type": "object",
            "required": ["loc", "upd"],
            "additionalProperties": false,
            "properties": {
                "loc": { "$ref": "#/$defs/Location" },
                "upd": { "$ref": "#/$defs/Updated" }
            }
        },
        "Location": {
            "type": "string",
            "format": "uri"
        },
        "Updated": {
            "type": "string",
            "format": "date-time"
        }
    }
}