Errata

This document includes errata for the Activity Streams and Activity Vocabulary documents.

Activity Streams

Section 4.2 lists the possible properties of a Link object. This list omits nameMap, preview, and attributedTo. The full list should be: id | name | nameMap | hreflang | mediaType | rel | height | width | preview | attributedTo.
In Section 2.3 "Dates and Times", the definition of as2-partial-time allows specifying a time-secfrac portion even if time-second is not defined. One candidate correction for this error is to replace the ABNF definition of as2-partial-time with a structure that requires time-second for time-secfrac to be used:
```
as2-partial-time = time-hour ":" time-minute [":" time-second [time-secfrac]]
```

Example 29 uses id as an alias for the @id property even though the Activity Streams 2.0 context has not been used, so that alias is not set up. The correct code would be:

{
    "@context": {
        "ex": "http://example.org/",
        "term": {
            "@type": "@id",
            "@id": "ex:term"
        }
    },
    "term": "ex:Foo"
}

Section 5.1 incorrectly refers to the id alias for the @id property, and the type alias of the @type property. Paragraph 4 should read, in part, ''In JSON-LD, Compact URI expansion of values applies to properties explicitly defined as "@type": "@id" in the @context definition.''

Example 2 has an incorrect value for the @vocab property. The correct example should be:

{
    "@context": {
    "@vocab": "https://www.w3.org/ns/activitystreams#",
    "ext": "https://canine-extension.example/terms/",
    "@language": "en"
  },
  "summary": "A note",
  "type": "Note",
  "content": "My dog has fleas.",
  "ext:nose": 0,
  "ext:smell": "terrible"
}

Section 8.1, "The application/activity+json Media Type", does not mention considerations for fragment identifiers. In the absence of any defined considerations, one default is to fall back on the same treatment as with JSON-LD. One way to make this explicit is to add this sentence to the end of section 8.1: "Fragment identifiers used with application/activity+json are treated as in RDF syntaxes, as per RDF 1.1 Concepts and Abstract Syntax [RDF11-CONCEPTS]."

Activity Vocabulary

Example 150 has latitude and longitude properties with string values. The range of these properties is xsd:float. A correct example would be:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Place",
  "name": "San Francisco, CA",
  "longitude": 122.4167,
  "latitude": 37.7833
}

Example 80 has Image objects with width and height properties, which are only allowed on Link objects. One alternative is to use Link objects with the correct height and width as the url property for each Image object.

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "A simple note",
  "type": "Note",
  "content": "A simple note",
  "icon": [
    {
      "type": "Image",
      "summary": "Note (16x16)",
      "url": {
        "type": "Link",
        "href": "http://example.org/note1.png",
        "width": 16,
        "height": 16
      }
    },
    {
      "type": "Image",
      "summary": "Note (32x32)",
      "url": {
        "type": "Link",
        "href": "http://example.org/note2.png",
        "width": 32,
        "height": 32
      }
    }
  ]
}

The range of the units property is given as an enumerated set of values. Due to a formatting error, some of these values are shown with an incorrect leading space character. The correct range is:
```
"cm" | "feet" | "inches" | "km" | "m" | "miles" | xsd:anyURI
```

Example 58 includes a summary property on a Mention object, which is not allowed. A corrected example:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Mention",
  "href": "http://example.org/joe",
  "name": "Joe"
}

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.

Example 60, for the Tombstone type, is missing the @context property. The correct example should be:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "OrderedCollection",
  "totalItems": 3,
  "name": "Vacation photos 2016",
  "orderedItems": [
    {
      "type": "Image",
      "id": "http://image.example/1"
    },
    {
      "type": "Tombstone",
      "formerType": "Image",
      "id": "http://image.example/2",
      "deleted": "2016-03-17T00:00:00Z"
    },
    {
      "type": "Image",
      "id": "http://image.example/3"
    }
  ]
}

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

Example 79 has an Image object with width and height properties, which only indicate Link in their Domain. One alternative is to use a Link object with the correct height and width as the url property for each Image object.

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "A simple note",
  "type": "Note",
  "content": "This is all there is.",
  "icon": {
    "type": "Image",
    "name": "Note icon",
    "url": {
       "href": "http://example.org/note.png",
       "type": "Link",
       "width": 16,
       "height": 16
    }
  }
}

The Notes for the to property do not correctly identify the functionality (one or more) of the values of the property. The notes should read: "Identifies one or more entities that are part of the public primary audience of this Object."
The Notes for the bto property do not correctly identify the functionality (one or more) of the values of the property. The notes should read: "Identifies one or more entities that are part of the private primary audience of this Object."
The Notes for the cc property do not correctly identify the functionality (one or more) of the values of the property. The notes should read: "Identifies one or more entities that are part of the public secondary audience of this Object."
The Notes for the bcc property do not correctly define the range of the property, limiting it to only the Object type. The notes should read: "Identifies one or more entities that are part of the private secondary audience of this Object."
The description of the audience property should read "Identifies one or more entities that represent the total population of entities for which the object can be considered to be relevant."

Example 157 is not valid JSON because the content property extends over multiple lines. The correct example is:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "name": "A thank-you note",
  "type": "Note",
  "content": "Thank you <a href='http://sally.example.org'>@sally</a> for all your hard work! <a href='http://example.org/tags/givingthanks'>#givingthanks</a>",
  "to": {
    "name": "Sally",
    "type": "Person",
    "id": "http://sally.example.org"
  },
  "tag": {
    "id": "http://example.org/tags/givingthanks",
    "name": "#givingthanks"
  }
}

Example 102 is missing a type property on the Link value of the url property. For clarity, the example should read:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Video",
  "name": "Cool New Movie",
  "duration": "PT2H30M",
  "preview": {
    "type": "Video",
    "name": "Trailer",
    "duration": "PT1M",
    "url": {
      "type": "Link",
      "href": "http://example.org/trailer.mkv",
      "mediaType": "video/mkv"
    }
  }
}

In Section 4, the range of the formerType property is given as Object. The property should have the same range as the type property for which it forms a replacement for deleted Tombstone objects.

Example 75 erroneously includes a summary property on a Link object. The corrected example:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "Sally's blog posts",
  "type": "Collection",
  "totalItems": 3,
  "current": {
    "type": "Link",
    "name": "Most Recent Items",
    "href": "http://example.org/collection"
  },
  "items": [
    "http://example.org/posts/1",
    "http://example.org/posts/2",
    "http://example.org/posts/3"
  ]
}

Example 77 erroneously includes a summary property on a Link object. The corrected example:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "Sally's blog posts",
  "type": "Collection",
  "totalItems": 3,
  "first": {
    "type": "Link",
    "name": "First Page",
    "href": "http://example.org/collection?page=0"
  }
}

Example 87 erroneously includes a summary property on a Link object. The corrected example:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "A collection",
  "type": "Collection",
  "totalItems": 5,
  "last": {
    "type": "Link",
    "name": "Last Page",
    "href": "http://example.org/collection?page=1"
  }
}

The definition of the tag property has two grammatical errors: it refers to "an objects" instead of "an object" and says that tag "implies associated by" instead of "implies association by". One possible correction is to change the definition to the following: 'One or more "tags" that have been associated with an object. A tag can be any kind of Object. The key difference between attachment and tag is that the former implies association by inclusion, while the latter implies association by reference.'
The second paragraph in the non-normative section "Mentions, Tags and Other Common Social Microsyntaxes" should read, 'While such microsyntaxes can be used within the values of the content, name, and summary properties on an Activity Streams Object, implementations are not expected to parse the values of those properties in order to determine the appropriate routing of notifications, categorization, or linking between objects. Instead, publishers are expected to make appropriate use of the vocabulary terms provided specifically for these purposes to communicate information to consumers.'

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