+ function asAtomAuthor()
+ {
+ $xs = new XMLStringer(true);
+
+ $xs->elementStart('author');
+ $xs->element('name', null, $this->nickname);
+ $xs->element('uri', null, $this->permalink());
+ $xs->elementEnd('author');
+
+ return $xs->getString();
+ }
+
+ /**
+ * Returns an XML string fragment with group information as an
+ * Activity Streams <activity:subject> element.
+ *
+ * Assumes that 'activity' namespace has been previously defined.
+ *
+ * @return string
+ */
+ function asActivitySubject()
+ {
+ return $this->asActivityNoun('subject');
+ }
+
+ /**
+ * Returns an XML string fragment with group information as an
+ * Activity Streams noun object with the given element type.
+ *
+ * Assumes that 'activity', 'georss', and 'poco' namespace has been
+ * previously defined.
+ *
+ * @param string $element one of 'actor', 'subject', 'object', 'target'
+ *
+ * @return string
+ */
+ function asActivityNoun($element)
+ {
+ $noun = ActivityObject::fromGroup($this);
+ return $noun->asString('activity:' . $element);
+ }
+
+ function getAvatar()
+ {
+ return empty($this->homepage_logo)
+ ? User_group::defaultLogo(AVATAR_PROFILE_SIZE)
+ : $this->homepage_logo;
+ }
+