code: public boolean hasCategory(final String conceptURI) {
          return Iterables.any(getCategories(),
                  new Predicate<TopicAnnotation>() {
  
                      @Override
                      public boolean apply(TopicAnnotation ta) {
                          return ta.getTopicReference().
                                  equals(conceptURI);
                      }
  
                  }
          );
      }
docs: Returns true if the contents has been categorized with a category identified by the URI passed by parameter
  
  @param conceptURI URI of the category concept
  @return