<p>

This specification describes a JSON-based [<cite><a class="bibref" href="#bib-RFC7159">RFC7159</a></cite>] serialization

Vocabulary</a> that follows the conventions defined by the

[<cite><a class="bibref" href="#bib-JSON-LD">JSON-LD</a></cite>] specification. While serialization forms other than

JSON-LD are possible, alternatives are not discussed by this

Expresses the statement "Martin Smith posted an article to the blog

'Martin's Blog' at 3:04 PM GMT on February 2, 2011." Some additional

details about the article, actor and target blog are given using properties

Vocabulary</a>.

</span></figcaption>

<div class="example"><div class="example-title"><span>Example 2</span></div><pre class="example highlight json prettyprint prettyprinted"><span class="pun">{</span><span class="pln">

<!--OddPage--><h2 role="heading" id="h2_model"><span class="secno">3. </span>Model</h2>

<p>

defines the abstract model for Activity Streams 2.0. The vocabulary

document defines seven distinct abstract classes: <a href="#asobject" class="internalDFN">Object</a>,

<a href="#dfn-link" class="internalDFN">Link</a>, <a href="#collection" class="internalDFN">Collection</a>, <a href="#activity" class="internalDFN">Activity</a>, <a href="#dfn-naturallanguagevalue" class="internalDFN">NaturalLanguageValue</a>,

<h3 role="heading" id="h3_object"><span class="secno">3.1 </span><dfn title="Object" id="asobject">Object</dfn></h3>

<p>

class is the primary base class for the Activity Streams vocabulary. An

implementations would typically create it's own set of subclasses that

derive from the <code>http://activitystrea.ms/2.0/Object</code> class as

In addition to having a global identifier in the form of an absolute IRI

and an "object type" (expressed in JSON-LD using the <code>@type</code> keyword),

all instances of the <code>Object</code> class share a common set of properties

These include:

<code>

</code>

</p>

<p>

While all properties are optional, all <code>Object</code> instances <em class="rfc2119" title="SHOULD">SHOULD</em>

</p>

<figure id="fig-following-is-an-example-object-that-uses-the-json-id-id-and-type-json-ld-keywords-to-express-the-global-identifier-and-object-type"><figcaption>Fig. <span class="figno">4</span> <span class="fig-title">Following is an example Object that uses the JSON-ID <code>@id</code> and <code>@type</code>

<h3 role="heading" id="h3_naturalLanguageValues"><span class="secno">3.2 </span><dfn title="NaturalLanguageValue" id="dfn-naturallanguagevalue">Natural Language Values</dfn></h3>

<p>

These are a representations of human-readable character sequences using one or more

languages. Within the JSON-LD serialization, they are expressed as either (1) a single JSON

string or (2) a JSON object mapping [<cite><a class="bibref" href="#bib-RFC5646">RFC5646</a></cite>] Language-Tags to localized, equivalent

</p>

<p>

property is a Natural Language value.

</p>

The target URI of the Link is the global identifier expressed in the JSON-LD

serialization using the <code>@id</code> keyword. In addition, all <code>Link</code>

instances share the following common set of properties as defined by the

<code>

</code>

</p>

<p>

For example, all <a title="Object" href="#asobject" class="internalDFN">Objects</a> can contain an

property whose value describes a graphical

representation of the containing object. This property will

typically be used to provide the URL to a JPEG, GIF or PNG type

<p>

RFC 5988 defines that all Links have a "link relation" that describes

the contextual purpose of the link. Within a <a href="#dfn-link" class="internalDFN">Link</a>,

provides the link relation value. If no <code>rel</code> property is

specified, the Link is not considered to have a specified link relation.

</p>

<p>

In additional to common properties supported by all <a href="#asobject" class="internalDFN">Object</a>

instances, <code>Activity</code> objects support the following additional

<code>

</code>

</p>

the activity, to infer the primary audience for many types of

activities, those do not work in every case and do not provide a

means of identifying the secondary audience. The

properties <em class="rfc2119" title="MAY">MAY</em> be used within an Activity to explicitly identify the

Primary and Secondary audiences.

</p>

<code>Collection</code> objects set of properties defined by the

<a href="activitystreams2-vocabulary">Vocabulary</a>. These include:

<code>

</code>

</p>

<p>

All <code>Object</code> instances can have an

used to describe the kinds of potential activities that can be taken with

regards to the object. The value is expressed as a JSON object conforming

to the <code><a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code>

JSON-LD keywords <code>@id</code> and <code>@type</code>, respectively.

</li>

<li>

properties as <a title="NaturalLanguageValue" href="#dfn-naturallanguagevalue" class="internalDFN">Natural Language Values</a>,

which means their values can be expressed as either a String or a

JSON-LD Language Map. In the 1.0 syntax, these are expressed

<h2 id="x2014-09-30">2014-09-30</h2>

<ul>

<li>Rework serialization model to be based on JSON-LD.</li>

<li>Remove notion of "Type Values".</li>

<li>Redefine "Link Values" as "Link".</li>

<li>Removed the "duplicates" property introduced in earlier AS2 drafts due to lack of any implementation evidence.</li>