<author>
 <activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
 <uri>{{ actor.url }}</uri>
 {% if actor.displayName %}
 <name>{{ actor.displayName }}</name>
 {% endif %}
 {% if actor.email %}
 <email>{{ actor.email }}</email>
 {% endif %}
</author>
