content: {
    "$defs": {
      "GrandfatherType": {
        "additionalProperties": false,
        "properties": {
          "family_name": {
            "type": "string"
          },
          "ip_addr": {
            "format": "ipv4",
            "type": "string"
          }
        },
        "required": [
          "family_name",
          "ip_addr"
        ],
        "type": "object"
      }
    },
    "$id": "https://github.com/invopop/jsonschema/grandfather-type",
    "$ref": "#/$defs/GrandfatherType",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }