{ "@context": [
    "https://www.w3.org/ns/activitystreams.jsonld",
    {
       "@vocab": "_:",
       "id": "@id",
       "objectType": "@type",
       "verb": "@type",
       "displayName": "as:name",
       "attachments": "as:attachment",
       "tags": "as:tag",
       "author": "as:attributedTo"
    }
  ]
}