type: array
description: |-
  An ordered array of textual representations in different mimetypes.

  Senders SHOULD specify at least one representation and SHOULD always
  include a plaintext representation.
  
  Receivers SHOULD use the first representation in the array that
  they understand.
title: TextContentBlock
items:
  type: object
  title: TextualRepresentation
  properties:
    mimetype:
      type: string
      description: The mimetype. Defaults to `text/plain` if omitted.
      example: "text/html"
    body:
      type: string
      description: |-
        The string content.

        Clients SHOULD validate and sanitize the content as they do
        for rich content associated with [`msgtype`](/client-server-api/#mroommessage-msgtypes)
        of [`m.room.message`](/client-server-api/#mroommessage).
  required:
  - body