Attendee

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Attendee",
  "type": "object",
  "properties": {
    "emailAddress": {
      "description": "The email addresses of the attendee",
      "type": "string",
      "format": "email",
      "examples": [
        "john.smith@contoso.com"
      ],
      "nullable": true
    },
    "person": {
      "oneOf": [
        {
          "$ref": "#/components/schemas/PersonData"
        },
        {
          "type": "null"
        }
      ]
    }
  },
  "required": [
    "emailAddress",
    "person"
  ],
  "additionalProperties": false
}