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<!DOCTYPE html>
<html>
<head>
<title>Activity Vocabulary</title>
<meta charset="UTF-8" />
<script src="http://www.w3.org/Tools/respec/respec-w3c-common" async class="remove"></script>
<script class="remove">
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edDraftURI: "http://jasnell.github.io/w3c-socialwg-activitystreams/activitystreams2-vocabulary.html",
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editors: [
{
name: "James M Snell",
url: "http://chmod777self.com",
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companyUrl: "http://ibm.com"
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additionalCopyrightHolders: ["Activity Streams Working Group", "IBM"],
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previousPublishDate: "2014-10-23",
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title: "JSON Activity Streams 1.0",
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<style>
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font-weight: normal;
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table { width: 100% ;}
td {
vertical-align: top;
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</head>
<body>
<section id="abstract">
<p>
This specification describes the Activity vocabulary.
</p>
<section id="authorsnote" class="informative">
<h2>Author's Note</h2>
<p>
This draft is heavily influenced by the JSON Activity
Streams 1.0 specification originally co-authored by Martin
Atkins, Will Norris, Chris Messina, Monica Wilkinson, Rob Dolin and
James Snell. The author is very thankful for their significant
contributions and gladly stands on their shoulders. Some portions of
the original text of Activity Streams 1.0 are used in this document.
</p>
</section>
</section>
<section id="sotd">
</section>
<section id="introduction">
<h2>Introduction</h2>
<p>
The Activity Streams 2.0 Core defines the JSON syntax for
Activity Streams. This document defines the vocabulary
terms.
</p>
<p>
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [[!RFC2119]].
</p>
<section id="termconventions">
<h2>Value Conventions</h2>
<p>
This specification uses IRIs [[!RFC3987]]. Every URI [[!RFC3986]] is also
an IRI, so a URI may be used wherever an IRI is named. There are two
special considerations: (1) when an IRI that is not also a URI is
given for dereferencing, it MUST be mapped to a URI using the steps
in Section 3.1 of [[!RFC3987]] and (2) when an IRI is serving as an "id"
value, it MUST NOT be so mapped.
</p>
<p>
Unless otherwise specified, all terms defined as <dfn>timestamp</dfn> values
MUST conform to the "date-time" production in [[!RFC3339]], with an
uppercase "T" character used to separate date and time, and an
uppercase "Z" character in the absence of a numeric time zone offset.
All such timestamps SHOULD be represented relative to Coordinated
Universal Time (UTC).
</p>
</section>
</section>
<section id="types">
<h2>Classes</h2>
<p>Base URI: <code>http://www.w3.org/ns/activitystreams#</code>.</p>
<p>
Classes: <code>
<a>Object</a> | <a>Link</a> | <a>Activity</a> | <a>Collection</a> | <a>NaturalLanguageValue</a> |
<a>Verb</a> | <a>ObjectType</a>
</code>
</p>
<table>
<thead>
<tr>
<th>Class</th>
<th colspan="2" style="width: 40%">Description</th>
<th style="width: 40%">Terms</th>
</tr>
</thead>
<tbody itemscope itemtype="http://www.w3.org/2002/07/owl#Class" itemid="http://www.w3.org/ns/activitystreams#Object">
<tr>
<td rowspan="2" ><dfn itemprop="label">Object</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#Object</code></td>
<td rowspan="3" >
<p><code><a>language</a> | <a>displayName</a> | <a>alias</a> | <a>author</a> | <a>content</a> |
<a>summary</a> | <a>title</a> | <a>icon</a> | <a>image</a> | <a>location</a> |
<a>generator</a> | <a>provider</a> | <a>published</a> | <a>updated</a> | <a>startTime</a> |
<a>endTime</a> | <a>validFrom</a> | <a>validAfter</a> | <a>validUntil</a> | <a>validBefore</a> |
<a>duration</a> | <a>rating</a> | <a>attachment</a> | <a>height</a> | <a>width</a> | <a>tag</a> |
<a>inReplyTo</a> | <a>scope</a> | <a>action</a> | <a>memberOf</a> | <a>url</a> | <a>resultOf</a> | <a>replies</a></code></p>
</td>
</tr>
<tr>
<td >Notes:</td>
<td itemprop="comment">
Describes an object of some kind. The Object class serves as a base class
for many of the other kinds of objects defined in the Activity and Actions
Vocabulary.
</td>
</tr>
</tbody>
<tbody itemscope itemtype="http://www.w3.org/2002/07/owl#Class" itemid="http://www.w3.org/ns/activitystreams#Link">
<tr>
<td rowspan="2" ><dfn itemprop="label">Link</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#Link</code></td>
<td rowspan="3" >
<p><code><a>rel</a> | <a>mediaType</a> | <a>language</a> | <a>displayName</a> |
<a>title</a> | <a>hreflang</a></code></p>
</td>
</tr>
<tr>
<td >Notes:</td>
<td itemprop="comment">
Describes a link to a separate resource.
</td>
</tr>
</tbody>
<tbody itemscope itemtype="http://www.w3.org/2002/07/owl#Class" itemid="http://www.w3.org/ns/activitystreams#Activity">
<tr>
<td rowspan="3" ><dfn itemprop="label">Activity</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#Activity</code></td>
<td rowspan="3" >
<p><code><a title="verb-term">verb</a> | <a>actor</a> | <a title="object-term">object</a> | <a>target</a> | <a>result</a> |
<a>instrument</a> | <a>participant</a> | <a>priority</a> | <a>status</a> | <a>to</a> |
<a>bto</a> | <a>cc</a> | <a>bcc</a></code></p>
<p><i>From <code><a>Object</a></code></i>:<br/>
<code><a>language</a> | <a>displayName</a> | <a>alias</a> | <a>author</a> | <a>content</a> |
<a>summary</a> | <a>title</a> | <a>icon</a> | <a>image</a> | <a>location</a> |
<a>generator</a> | <a>provider</a> | <a>published</a> | <a>updated</a> | <a>startTime</a> |
<a>endTime</a> | <a>validFrom</a> | <a>validAfter</a> | <a>validUntil</a> | <a>validBefore</a> |
<a>duration</a> | <a>rating</a> | <a>attachment</a> | <a>height</a> | <a>width</a> | <a>tag</a> |
<a>inReplyTo</a> | <a>scope</a> | <a>action</a> | <a>memberOf</a> | <a>url</a> | <a>resultOf</a> | <a>replies</a></code></p>
</td>
</tr>
<tr>
<td >Notes:</td>
<td itemprop="comment">
Describes some form of action that is currently happening or that has already happened.
</td>
</tr>
<tr>
<td >Type Of:</td>
<td ><a itemprop="http://www.w3.org/2000/01/rdf-schema#subClassOf" href="#dfn-object"><code>Object</code></a></td>
</tr>
</tbody>
<tbody itemscope itemtype="http://www.w3.org/2002/07/owl#Class" itemid="http://www.w3.org/ns/activitystreams#Collection">
<tr>
<td rowspan="3" ><dfn itemprop="label">Collection</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#Collection</code></td>
<td rowspan="3" >
<p><code><a>items</a> | <a>totalItems</a> | <a>itemsPerPage</a> | <a>startIndex</a> |
<a>itemsAfter</a> | <a>itemsBefore</a> | <a>current</a> | <a>next</a> | <a>prev</a> |
<a>first</a> | <a>last</a> | <a>self</a></code></p>
<p><i>From <code><a>Object</a></code></i>:<br/>
<code><a>language</a> | <a>displayName</a> | <a>alias</a> | <a>author</a> | <a>content</a> |
<a>summary</a> | <a>title</a> | <a>icon</a> | <a>image</a> | <a>location</a> |
<a>generator</a> | <a>provider</a> | <a>published</a> | <a>updated</a> | <a>startTime</a> |
<a>endTime</a> | <a>validFrom</a> | <a>validAfter</a> | <a>validUntil</a> | <a>validBefore</a> |
<a>duration</a> | <a>rating</a> | <a>attachment</a> | <a>height</a> | <a>width</a> | <a>tag</a> |
<a>inReplyTo</a> | <a>scope</a> | <a>action</a> | <a>memberOf</a> | <a>url</a> | <a>resultOf</a> | <a>replies</a></code></p>
</td>
</tr>
<tr>
<td >Notes:</td>
<td itemprop="comment">
An unordered collection of <code><a>Object</a></code> instances.
</td>
</tr>
<tr>
<td >Type Of:</td>
<td ><a itemprop="http://www.w3.org/2000/01/rdf-schema#subClassOf" href="#dfn-object"><code>Object</code></a></td>
</tr>
</tbody>
<tbody itemscope itemtype="http://www.w3.org/2002/07/owl#Class" itemid="http://www.w3.org/ns/activitystreams#NaturalLanguageValue">
<tr>
<td rowspan="2" ><dfn itemprop="label">NaturalLanguageValue</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#NaturalLanguageValue</code></td>
<td rowspan="3" ></td>
</tr>
<tr>
<td >Notes:</td>
<td itemprop="comment">
A Natural Language Value is a representation of human-readable character sequences in
one or more languages.
</td>
</tr>
</tbody>
<tbody itemscope itemtype="http://www.w3.org/2002/07/owl#Class" itemid="http://www.w3.org/ns/activitystreams#Verb">
<tr>
<td rowspan="3" ><dfn itemprop="label">Verb</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#Verb</code></td>
<td rowspan="3" >
<p><i>From <code><a>Object</a></code></i>:<br/>
<code><a>language</a> | <a>displayName</a> | <a>alias</a> | <a>author</a> | <a>content</a> |
<a>summary</a> | <a>title</a> | <a>icon</a> | <a>image</a> | <a>location</a> |
<a>generator</a> | <a>provider</a> | <a>published</a> | <a>updated</a> | <a>startTime</a> |
<a>endTime</a> | <a>validFrom</a> | <a>validAfter</a> | <a>validUntil</a> | <a>validBefore</a> |
<a>duration</a> | <a>rating</a> | <a>attachment</a> | <a>height</a> | <a>width</a> | <a>tag</a> |
<a>inReplyTo</a> | <a>scope</a> | <a>action</a> | <a>memberOf</a> | <a>url</a> | <a>resultOf</a> | <a>replies</a></code></p>
</td>
</tr>
<tr>
<td >Notes:</td>
<td itemprop="comment">
Describes a Verb.
</td>
</tr>
<tr>
<td >Type Of:</td>
<td ><a itemprop="http://www.w3.org/2000/01/rdf-schema#subClassOf" href="#dfn-object"><code>Object</code></a></td>
</tr>
</tbody>
<tbody itemscope itemtype="http://www.w3.org/2002/07/owl#Class" itemid="http://www.w3.org/ns/activitystreams#ObjectType">
<tr>
<td rowspan="3" ><dfn itemprop="label">ObjectType</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#ObjectType</code></td>
<td rowspan="3" >
<p><i>From <code><a>Object</a></code></i>:<br/>
<code><a>language</a> | <a>displayName</a> | <a>alias</a> | <a>author</a> | <a>content</a> |
<a>summary</a> | <a>title</a> | <a>icon</a> | <a>image</a> | <a>location</a> |
<a>generator</a> | <a>provider</a> | <a>published</a> | <a>updated</a> | <a>startTime</a> |
<a>endTime</a> | <a>validFrom</a> | <a>validAfter</a> | <a>validUntil</a> | <a>validBefore</a> |
<a>duration</a> | <a>rating</a> | <a>attachment</a> | <a>height</a> | <a>width</a> | <a>tag</a> |
<a>inReplyTo</a> | <a>scope</a> | <a>action</a> | <a>memberOf</a> | <a>url</a> | <a>resultOf</a> | <a>replies</a></code></p>
</td>
</tr>
<tr>
<td >Notes:</td>
<td itemprop="comment">
Describes an Object Type.
</td>
</tr>
<tr>
<td >Type Of:</td>
<td ><a itemprop="http://www.w3.org/2000/01/rdf-schema#subClassOf" href="#dfn-object"><code>Object</code></a></td>
</tr>
</tbody>
</table>
</section>
<section id="terms">
<h2>Terms</h2>
<p>Base URI: <code>http://www.w3.org/ns/activitystreams#</code>.</p>
<table>
<thead>
<tr>
<th style="width: 15%">Term</th>
<th colspan="2">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td rowspan="4" ><dfn>language</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#language</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Establishes the default language assumed for human-readable,
natural-language metadata values included in the object. The
value MUST be an [[!RFC5646]] Language-Tag.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code> | <code><a>Link</a></code></td>
</tr>
<tr>
<td >Range:</td>
<td >[[!RFC5646]] Language Tag</td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>displayName</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#displayName</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
A simple, human-readable, plain-text name for the object. HTML
markup MUST NOT be included..
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>NaturalLanguageValue</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>rel</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#rel</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
The RFC 5988 Link Relation associated with a <code><a>Link</a></code>.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Link</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td >[[!RFC5988]] or <a class="bibref" href="http://www.w3.org/TR/html5/document-metadata.html#attr-link-rel">[HTML5]</a> Link Relation</td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>mediaType</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#mediaType</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
<p>When used on a <a>Link</a>, identifies the MIME media type of the
referenced resource.</p>
<p>When used on a <a href="activitystreams2-actions.html#dfn-payload">Payload</a>, identifies the MIME media type of the
payload described. For instance, a <a href="activitystreams2-actions.html#dfn-payload">Payload</a> object with a <code>mediaType</code>
of "<code>application/json</code>" would describe a JSON resource.</p>
<p>When used on a <a href="activitystreams2-actions.html#embeddedview">EmbeddedView</a>, identifies the MIME media type of
value contained in the <a>content</a> property, if any.</p>
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Link</a></code> | <code><a href="activitystreams2-actions.html#dfn-payload">Payload</a></code> | <code><a href="activitystreams2-actions.html#dfn-embeddedview">EmbeddedView</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td >MIME Media Type</td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>hreflang</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#hreflang</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Hints as to the language used by the target resource. Value MUST be a [[!RFC5646]] Language-Tag.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Link</a></code></td>
</tr>
<tr>
<td >Range:</td>
<td >[[!RFC5646]] Language Tag</td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn title="verb-term">verb</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#verb</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Identifies the type of action represented in the Activity
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a></code> | <code><a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><a title="Verb"><code>Verb</code></a></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>actor</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#actor</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Describes one or more entities that either performed or are expected to
perform the activity.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a> | <a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn title="object-term">object</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#object</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Describes the direct object of the activity. For instance, in the activity
"John saved a movie to his wishlist", the object of the activity is the
movie saved.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a> | <a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>target</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#target</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Describes the indirect object, or target, of the activity. The precise
meaning of the target is largely dependent on the <code><a title="verb-term">verb</a></code>
but will often be the object of the English preposition "to". For instance,
in the activity "John saved a movie to his wishlist", the target of the
activity is John's wishlist.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a> | <a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="5" ><dfn>result</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#result</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Describes the result of the activity. For instance, if a particular action
results in the creation of a new resource, the <code><a>result</a></code>
property can be used to describe that new resource.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><a title="Object"><code>Activity</code></a></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
<tr>
<td >Reverse Of:</td>
<td ><code><a>resultOf</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>instrument</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#instrument</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
An optional <code><a>Object</a></code> that describes one or more objects used to perform
the activity. For instance, in the activity, "Sally played music with a piano",
the instrument of the activity is the piano.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a> | <a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>participant</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#participant</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
An optional <code><a>Object</a></code> that describes one or more additional actors
that have (or will have) participated in the activity. For instance, in the
activity, "Sally went to the movies with Joe", Sally is the primary actor,
while Joe is a participant.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a> | <a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="5" ><dfn>priority</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#priority</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
<p>An optional indicator of the relative priority, or importance, that the creator
of the activity considers it to have. Represented as a non-negative, numeric
decimal between 0.00 and 1.00 (inclusive), with two decimal places of precision.
If the property is omitted or set to null, the assumption is that a default
priority can be assumed by the implementation. The value 0.00 represents the
lowest possible priority while 1.00 represents the highest.</p>
<p>
The use of the <code><a>priority</a></code> property does not impose any specific
processing or display requirements on the part of any consuming implementation.
</p>
<p>
Expressing the value as a range of numeric decimal values is intended
to provide the greatest level of flexibility in the expression and
consumption of prioritization detail. It is expected that
implementors consuming activity objects containing <code><a>priority</a></code>
will utilize and expose the additional information in a number of
different ways depending on the unique requirements of each
application use case.
</p>
<p>
Many existing systems do not represent priority values as numeric
ranges. Such systems might use fixed, labeled brackets such as
"<code>low</code>", "<code>normal</code>" and "<code>high</code>"
or "<code>urgent</code>". Similar mechanisms can be
established, by convention, when using the <code><a>priority</a></code> property. In
typical use, it is RECOMMENDED that implementations wishing to work
with such defined categories treat <code><a>priority</a></code> property values in the
range <code>0.00</code> to <code>0.25</code> as "<code>low</code>" priority; values
greater than <code>0.25</code> to <code>0.75</code> as "<code>normal</code>" priority;
and values greater than <code>0.75</code> to <code>1.00</code> as
"<code>high</code>" priority. Specific implementations are free to establish
alternative conventions for the grouping of priority values with the
caveat that such conventions likely will not be understood by all
implementations.
</p>
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a> | <a href="activitystreams2-actions.html#dfn-potentialaction">PotentialAction</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code>xsd:decimal</code></td>
</tr>
<tr>
<td >Domain:</td>
<td >0.00 <= priority <= 1.00</td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>status</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#status</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
An optional, explicit indicator of the current status of the activity.
"<code>http://www.w3.org/ns/activitystreams#status-active</code>" indicates that the activity is ongoing,
"<code>http://www.w3.org/ns/activitystreams#status-canceled</code>" indicates that the activity has been aborted,
"<code>http://www.w3.org/ns/activitystreams#status-completed</code>" indicates that the activity has concluded,
"<code>http://www.w3.org/ns/activitystreams#status-pending</code>" indicates that the activity is expected to begin,
"<code>http://www.w3.org/ns/activitystreams#status-tentative</code>" indicates that the activity has been proposed,
and "<code>http://www.w3.org/ns/activitystreams#status-voided</code>" indicates that the activity has been retracted
or should be considered invalid.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code>xsd:anyURI</code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>to</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#to</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Specifies the public primary audience
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Link</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>cc</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#cc</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Specifies the public secondary audience
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Link</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>bto</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#bto</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Specifies the private primary audience
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Link</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>bcc</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#bcc</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Specifies the private secondary audience
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a title="Activity">Activity</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Link</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>alias</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#alias</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
Provides a contextually meaningful alternative label for the object
in addition to the <code><a>id</a></code>. For instance, within some
systems, groups can be identified by both a unique global identifier
and a more "human-friendly" label such as "<code>@friends</code>" or
"<code>@network</code>". The value of the <code><a>alias</a></code>
property MUST match either the <code>isegment-nz-nc</code> or
<code>IRI</code> productions in [[RFC3987]]. The use of a relative
reference other than a simple name is not allowed.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code>xsd:anyURI</code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>author</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#author</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
An <code><a>Object</a></code> referencing one or more entities credited
with creating or authoring the object.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>content</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#content</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
A <code><a>NaturalLanguageValue</a></code> description of the object content. HTML
markup, including visual elements such as images, MAY be included.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>NaturalLanguageValue</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>summary</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#summary</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
A <code><a>NaturalLanguageValue</a></code> summarization of the object. HTML markup,
including visual images such as images, MAY be included.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>NaturalLanguageValue</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>title</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#title</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
A <code><a>NaturalLanguageValue</a></code> title of the object. HTML markup,
including visual images such as images, MAY be included. The
<code><a>title</a></code> and <code><a>displayName</a></code>
properties are closely related and overlap in function with the
key difference being that <code><a>title</a></code> is permitted
to contain HTML markup while <code><a>displayName</a></code> is
not.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code> | <a title="Link"><code>Link</code></a></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a>NaturalLanguageValue</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>icon</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#icon</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
A <code><a title="Link">Link</a></code> referencing one or more graphic
representations of the object. The visual element SHOULD have an aspect
ratio of one (horizontal) to one (vertical) and SHOULD be suitable for
presentation at a small size.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a title="Link">Link</a></code></td>
</tr>
</tbody>
<tbody>
<tr>
<td rowspan="4" ><dfn>image</dfn></td>
<td style="width: 10%">URI:</td>
<td ><code>http://www.w3.org/ns/activitystreams#image</code></td>
</tr>
<tr>
<td >Notes:</td>
<td >
A <code><a>Link</a> referencing one or more graphic representations
of the object. Unlike the <code><a>icon</a></code> property, there are
no aspect ratio or display size limitations assumed.
</td>
</tr>
<tr>
<td >Domain:</td>
<td ><code><a>Object</a></code></td>
</tr>
<tr>
<td >Value:</td>
<td ><code><a title="Link">Link</a></code></td>
</tr>
</tbody>
<tbody>