{
    "$schema": "http://json-schema.org/draft-04/schema",
    "category": {
        "description": "The machine-readable enumeration of valid image types.",
        "enum": [
            "photograph",
            "graphic",
            "illustration",
            "thumbnail"
        ],
        "type": "string"
    },
    "description": "A more specific category for an image.",
    "title": "Image Type",
    "type": "string"
}