The actor is the entity who did the activity. It will be conveyed via the atom/author element. The actor properties are placed inside the author element.
atom:id within author, otherwise default to author:uriatom:nameatom:link rel="alternate"atom:link rel="photo"Object-type: if not present, defaults to .../person <author>
<uri>http://myspace.com/ciberch</uri>
<activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
<id>tag:myspace.com,2009:/Person/4859568</id>
<title>Monica Keller</title>
<link rel="alternate" type="text/html" href="http://www.myspace.com/ciberch" />
<link rel="photo" type="image/jpeg" href="http://c3.ac-images.myspacecdn.com/images02/151/s_88bcd3986d104044888e07298a5180d6.jpg" />
<poco:name>
<poco:givenName>Monica</poco:givenName>
<poco:familyName>Keller</poco:familyName>
</poco:name>
<poco:displayName>Monica Keller</poco:displayName>
<poco:preferredUsername>ciberch</poco:preferredUsername>
</author>
Shortened example, taking advantage of intelligent defaults:
<author>
<uri>http://myspace.com/ciberch</uri>
<name>Monica</name>
<poco:name>
<poco:givenName>Monica</poco:givenName>
<poco:familyName>Keller</poco:familyName>
<poco:name>
<author>
In the early ActivityStreams spec, the <actor> element was separate from the <author> element. In March 2010 these elements were merged as it became clear that extending the Atom author element was allowed.