{
    "$$version": 1,
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "additionalProperties": false,
    "$$order": [
        "host",
        "domain",
        "fqdn",
        "priority"
    ],
    "required": [
        "host",
        "domain",
        "fqdn",
        "priority"
    ],
    "title": "Formula",
    "properties": {
        "host": {
            "type": "string",
            "default": "www"
        },
        "domain": {
            "type": "string",
            "format": "hostname",
            "default": "example.com"
        },
        "fqdn": {
            "type": "string",
            "format": "hostname",
            "$$formula": "host ~ `.` ~ domain"
        },
        "priority": {
            "type": "integer",
            "$$formula": "-7"
        }
    }
}