Variations of inReplyTo

The property is defined here. The goal of this support table is to show how applications react to inReplyTo containing a wide variation of allowed objects. As Fediverse applications generally only give one the option to reply to a single element, the lacking support should not be surprising.

Objects

Object 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "valid uri",
  "id": "http://actor.example/Rx3OQx6y5sc",
  "inReplyTo": "http://pasture-one-actor/assets/note1.jsonap",
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 2

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "invalid uri",
  "id": "http://actor.example/DgvuehH7XBk",
  "inReplyTo": "http://invalid.example/",
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 3

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "list",
  "id": "http://actor.example/DDy4DdFaRzM",
  "inReplyTo": [
    "http://pasture-one-actor/assets/note1.jsonap"
  ],
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 4

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "Link in inReplyTo",
  "id": "http://actor.example/YhvjTW0lxIg",
  "inReplyTo": {
    "href": "http://pasture-one-actor/assets/note1.jsonap",
    "type": "Link"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 5

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "two elements in inReplyTo",
  "id": "http://actor.example/mOBdbrL3Hcs",
  "inReplyTo": [
    "http://pasture-one-actor/assets/note1.jsonap",
    "http://pasture-one-actor/assets/note2.jsonap"
  ],
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 6

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "collection",
  "id": "http://actor.example/uB9ZuxCizcI",
  "inReplyTo": {
    "items": [
      "http://pasture-one-actor/actor"
    ],
    "type": "Collection"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 7

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "embedded note",
  "id": "http://actor.example/qc1JtK3mKPg",
  "inReplyTo": {
    "@context": "https://www.w3.org/ns/activitystreams",
    "attributedTo": "http://pasture-one-actor/actor",
    "content": "One",
    "id": "http://pasture-one-actor/assets/note1.jsonap",
    "published": "2024-01-06T13:11:45Z",
    "to": [
      "as:Public"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Activities

Activity 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/JVcvJYcx9G0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "valid uri",
    "id": "http://actor.example/56s9XuHMxwo",
    "inReplyTo": "http://pasture-one-actor/assets/note1.jsonap",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 2

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/8ruiuUXf7VY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "invalid uri",
    "id": "http://actor.example/aKwdEN_c1-U",
    "inReplyTo": "http://invalid.example/",
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 3

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/EWL-0j8TDy0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "list",
    "id": "http://actor.example/uLb4-mg1pbs",
    "inReplyTo": [
      "http://pasture-one-actor/assets/note1.jsonap"
    ],
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 4

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/X49D8SNgkDk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "Link in inReplyTo",
    "id": "http://actor.example/dqR3dX0M5p8",
    "inReplyTo": {
      "href": "http://pasture-one-actor/assets/note1.jsonap",
      "type": "Link"
    },
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 5

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/6b4E-bv4LLk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "two elements in inReplyTo",
    "id": "http://actor.example/IJ2wYJ5Obzo",
    "inReplyTo": [
      "http://pasture-one-actor/assets/note1.jsonap",
      "http://pasture-one-actor/assets/note2.jsonap"
    ],
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 6

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/yWmqqRx4ykE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "collection",
    "id": "http://actor.example/bsB2NPO96kA",
    "inReplyTo": {
      "items": [
        "http://pasture-one-actor/actor"
      ],
      "type": "Collection"
    },
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 7

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/CBzCu18Jbwk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "embedded note",
    "id": "http://actor.example/8JF8-UW4qmU",
    "inReplyTo": {
      "@context": "https://www.w3.org/ns/activitystreams",
      "attributedTo": "http://pasture-one-actor/actor",
      "content": "One",
      "id": "http://pasture-one-actor/assets/note1.jsonap",
      "published": "2024-01-06T13:11:45Z",
      "to": [
        "as:Public"
      ],
      "type": "Note"
    },
    "published": "2025-03-07T11:42:22Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-03-07T11:42:22Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}