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Update ERRATA.md #590

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Update ERRATA.md
evanp Mar 13, 2024
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Merge branch 'main' into issue-445-errata
evanp Aug 29, 2025
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17 changes: 17 additions & 0 deletions ERRATA.md
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Expand Up @@ -80,3 +80,20 @@ This document includes errata for the [Activity Streams](https://www.w3.org/TR/a
- Unlike `latitude` and `longitude`, the domain of the `altitude` term is the `Object` type. The `altitude` term should be included in the list of properties of an `Object`. Because `altitude` is primarily documented as a property of a `Place`, publishers should not include `altitude` on objects that are not of type `Place`, and consumers should accept objects with this property that aren't of type `Place`.

- The domain of the `attributedTo` property is both `Link` and `Object`. `attributedTo` should be included in the list of properties of a `Link`.

- Example 146 in Activity Vocabulary has an error in the format of the `startTime` property. The full example should be:
```
{
"@context": "https://www.w3.org/ns/activitystreams",
"summary": "Sally became a friend of Matt",
"type": "Create",
"actor": "http://sally.example.org",
"object": {
"type": "Relationship",
"subject": "http://sally.example.org",
"relationship": "http://purl.org/vocab/relationship/friendOf",
"object": "http://matt.example.org",
"startTime": "2015-04-21T12:34:56Z"
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It seems odd to me that a friendship is assigned a start time down to the second. Perhaps it could be bumped to the nearest hour or even the nearest day, even if sometimes the nearest minute might be known...

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I think the resolution of startTime in the example is ok down to the second or even microsecond as long as it conforms to the range https://www.w3.org/TR/activitystreams-vocabulary/#dfn-starttime . The value generally reflects the moment that the individual triggers a button while the server minding that the client's clock may not be in sync with server's clock.

That said, a Note or Considerations section could indicate:

  • clock sync concern and any changes to the value after server's processing (possible error handling here if the value is beyond an acceptable or meaningful range) - this may need to be a separate issue if not already visited
  • privacy concerns with respect to the resolution

}
}
```