{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "schema:Message",
  "title": "Message",
  "description": "A single message from a sender to one or more organizations or people.",
  "type": "object",
  "allOf": [
    {
      "description": "The most generic kind of creative work, including books, movies, photographs, software programs, etc.",
      "$ref": "schema:CreativeWork"
    }
  ],
  "properties": {
    "bccRecipient": {
      "description": "A sub property of recipient. The recipient blind copied on a message.",
      "oneOf": [
        {
          "anyOf": [
            { "$ref": "schema:ContactPoint" },
            { "$ref": "schema:Organization" },
            { "$ref": "schema:Person" }
          ]
        },
        {
          "type": "array",
          "items": {
            "anyOf": [
              { "$ref": "schema:ContactPoint" },
              { "$ref": "schema:Organization" },
              { "$ref": "schema:Person" }
            ]
          }
        }
      ]
    },
    "ccRecipient": {
      "description": "A sub property of recipient. The recipient copied on a message.",
      "oneOf": [
        {
          "anyOf": [
            { "$ref": "schema:ContactPoint" },
            { "$ref": "schema:Organization" },
            { "$ref": "schema:Person" }
          ]
        },
        {
          "type": "array",
          "items": {
            "anyOf": [
              { "$ref": "schema:ContactPoint" },
              { "$ref": "schema:Organization" },
              { "$ref": "schema:Person" }
            ]
          }
        }
      ]
    },
    "dateRead": {
      "description": "The date/time at which the message has been read by the recipient if a single recipient exists.",
      "anyOf": [
        { "type": "string", "format": "date" },
        { "type": "string", "format": "date-time" }
      ]
    },
    "dateReceived": {
      "description": "The date/time the message was received if a single recipient exists.",
      "type": "string",
      "format": "date-time"
    },
    "dateSent": {
      "description": "The date/time at which the message was sent.",
      "type": "string",
      "format": "date-time"
    },
    "messageAttachment": {
      "description": "A CreativeWork attached to the message.",
      "oneOf": [
        { "$ref": "schema:CreativeWork" },
        { "type": "array", "items": { "$ref": "schema:CreativeWork" } }
      ]
    },
    "recipient": {
      "description": "A sub property of participant. The participant who is at the receiving end of the action.",
      "oneOf": [
        {
          "anyOf": [
            { "$ref": "schema:Audience" },
            { "$ref": "schema:ContactPoint" },
            { "$ref": "schema:Organization" },
            { "$ref": "schema:Person" }
          ]
        },
        {
          "type": "array",
          "items": {
            "anyOf": [
              { "$ref": "schema:Audience" },
              { "$ref": "schema:ContactPoint" },
              { "$ref": "schema:Organization" },
              { "$ref": "schema:Person" }
            ]
          }
        }
      ]
    },
    "sender": {
      "description": "A sub property of participant. The participant who is at the sending end of the action.",
      "oneOf": [
        {
          "anyOf": [
            { "$ref": "schema:Audience" },
            { "$ref": "schema:Organization" },
            { "$ref": "schema:Person" }
          ]
        },
        {
          "type": "array",
          "items": {
            "anyOf": [
              { "$ref": "schema:Audience" },
              { "$ref": "schema:Organization" },
              { "$ref": "schema:Person" }
            ]
          }
        }
      ]
    },
    "toRecipient": {
      "description": "A sub property of recipient. The recipient who was directly sent the message.",
      "oneOf": [
        {
          "anyOf": [
            { "$ref": "schema:Audience" },
            { "$ref": "schema:ContactPoint" },
            { "$ref": "schema:Organization" },
            { "$ref": "schema:Person" }
          ]
        },
        {
          "type": "array",
          "items": {
            "anyOf": [
              { "$ref": "schema:Audience" },
              { "$ref": "schema:ContactPoint" },
              { "$ref": "schema:Organization" },
              { "$ref": "schema:Person" }
            ]
          }
        }
      ]
    }
  }
}