anchor.diff:  if (document.isBlog()) blogEvent.select(new AnnotationLiteral<Updated>(){}).fire(document);
   -------------------------------------------------------------------------------------------
   
  -The above shown event is fired with two qualifiers - `@Blog` and `@Updated`. 
  +The above shown event is fired with two qualifiers - `@Blog` and `@Updated`.
   An observer method is notified if the set of observer qualifiers is a subset of the fired event's qualifiers.
   Assume the following observers in this example:
   
  
positive.code: @Inject @Updated Event<Document> anotherDocumentEvent;
  -------------------------------------------
  
  If the observer does specify qualifiers, it will be notified of an event if the event 
  object is assignable to the observed event type, and if the set of observed event 
  qualifiers is a subset of all the event qualifiers of the event.
  
  The observer method may have additional parameters, which are injection
  
negative.code: -----------------------------------------------------------------------------
  
  An observer method need not specify any event qualifiers—in this case it
  is interested in every event whose type is assignable to the observed event type.
  Such observer will trigger on both events shown below:
  
  [source.JAVA, java]
  