The outbox MUST be an OrderedCollection.

{
  "id": "urn:uuid:003a3be2-fb58-4812-a3a3-795067254327",
  "type": "Behavior",
  "uuid": "003a3be2-fb58-4812-a3a3-795067254327",
  "content": "The outbox MUST be an OrderedCollection.",
  "tag": [
    {
      "name": "ActivityPubServer",
      "id": "https://socialweb.coop/tag/ActivityPubServer"
    }
  ],
  "origin": {
    "source": "https://www.w3.org/TR/activitypub/",
    "section": {
      "id": "https://www.w3.org/TR/activitypub/#outbox",
      "branch": [
        5,
        1
      ]
    },
    "selector": {
      "type": "TextQuoteSelector",
      "exact": "The outbox MUST be an OrderedCollection.\n",
      "prefix": "The outbox is discovered through the outbox property of an actor's profile. \n",
      "suffix": "The outbox stream contains activities the user has published, subject to the ability of the requestor to retrieve the activity\n"
    }
  },
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "https://socialweb.coop/ns/testing/context.json"
  ]
}