code: @SuppressWarnings("unchecked")
      public Collection<SentimentAnnotation> getSentimentAnnotations() {
          Collection<? extends Enhancement> result = enhancements.get(SentimentAnnotation.class);
          return result == null ? Collections.<SentimentAnnotation>emptySet() : 
              Collections.unmodifiableCollection((Collection<SentimentAnnotation>) result);
      }
docs: Returns the {@link Collection} of extracted {@link SentimentAnnotation}s. This
  allows to process low level sentiment values extracted from sub-sections of the
  document (e.g. on Sentence level). Use {@link #getDocumentSentiment()} to
  get the overall sentiment of the document as a whole
  
  @return A collection of Sentiment annotations for sub-sections of the document
  @see #getDocumentSentiment()