{
    "fields": [
        {
            "name": "Local authority",
            "description": "Local authority responsible for the library service",
            "type": "string",
            "format": "default",
            "constraints": {
                "required": true
            }
        },
        {
            "name": "Count date",
            "description": "The date this count was completed",
            "type": "date",
            "format": "default",
            "constraints": {
                "required": true
            }
        },
        {
            "name": "Area code",
            "description": "Office for National Statistics geographic area code. Use Unknown where the area code is not known.",
            "type": "string",
            "format": "default",
            "constraints": {
                "required": true
            }
        },
        {
            "name": "Members",
            "description": "Count of active members (active in the last year) with address located in the specified area.",
            "type": "string",
            "format": "default",
            "constraints": {
                "required": true,
                "pattern": "^x$|^[5-9]{1}$|^[1-9]\\d{1,}$"
            }
        }
    ]
}