{
  "$schema": "http://json-schema.org/draft-06/schema#",
  "type": "object",
  "properties": {
    "text": {"type": "string"},
    "threadRoot": {"type": ["null", "string"], "format": "uri"},
    "threadParent": {"type": ["null", "string"], "format": "uri"},
    "createdAt": {"type": "number"},
    "mentions": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "url": {"type": "string", "format": "uri"},
          "name": {"type": ["null", "string"]}
        },
        "required": ["url"]
      }
    }
  },
  "required": ["text", "createdAt"]
}