{
  "objectType": "activity",
  "verb": "invite",
  "url": "http://example.com/this/invite",
  "actor": {
    "objectType": "person",
    "displayName": "Mr. Host",
    "url": "http://example.com/host"
  },
  "object": {
    "objectType": "person",
    "displayName": "Alice",
    "url": "http://example.com/alice"
  }
}
