+ // Returns the name of the inner template, or null if a simple text obtained
+ // from GetText should be printed.
+ public function template() { return null; }
+
+ // Returns the text to display in the onebox, or null if a
+ public function text() { return ''; }
+
+ // Returns the title of the onebox.
+ public function title() { return ''; }
+
+ // Should return true if this onebox needs to be considered as a warning and
+ // not just as a subscription offer.
+ public function warning() { return false; }