code: @SuppressWarnings("unchecked")
      public Collection<TopicAnnotation> getCategories() {
          Collection<? extends Enhancement> result = enhancements.get(TopicAnnotation.class);
          return (Collection<TopicAnnotation>) result; // Should be safe. Needs to be tested
      }
docs: Returns the {@link Collection} of extracted categories (topics) for the analyzed content
  
  @return