---
allOf:
  - $ref: core-event-schema/state_event.yaml
description: |- 
    A topic is a short message detailing what is currently being discussed in the room.
    It can also be used as a way to display extra information about the room, which may not
    be suitable for the room name.
    The room topic can also be set when creating a room using `/createRoom` with the `topic` key.'
    
    If the `topic` property is absent, null, or empty then the topic is unset. In other words,
    an empty `topic` property effectively resets the room to having no topic.
properties:
  content:
    properties:
      topic:
        description: The topic text.
        type: string
    required:
      - topic
    type: object
  state_key:
    description: A zero-length string.
    pattern: '^$'
    type: string
  type:
    enum:
      - m.room.topic
    type: string
title: Topic
type: object