matrix-spec/event-schemas/schema/v1/m.room.aliases

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "allOf": [{
        "$ref": "core#/definitions/state_event"
    }],
    "properties": {
        "content": {
            "type": "object",
            "properties": {
                "aliases": {
                    "type": "array",
                    "items": {
                        "type": "string"
                    }
                }
            },
            "required": ["aliases"]
        },
        "type": {
            "type": "string",
            "enum": ["m.room.aliases"]
        }
    }
}