code: @Override
      public void setCategories(final List<SyndCategory> categories) {
          getDCModule().setSubjects(SyndCategoryListFacade.convertElementsSyndCategoryToSubject(categories));
      }
docs: Sets the feed categories.
  <p>
  This method is a convenience method, it maps to the Dublin Core module subjects.
  <p>
  
  @param categories the list of SyndCategoryImpl elements with the feed categories to set, an
  empty list or <b>null</b> if none.