code: public boolean isRevisitDigest() {
  		String dupeType = get(CAPTURE_DUPLICATE_ANNOTATION);
  		return (dupeType != null && dupeType.equals(CAPTURE_DUPLICATE_DIGEST));
  	}
docs: whether this capture is a re-fetch of previously archived capture
  (<i>revisit</i>), detected by content's digest.
  <p>This method is meant for use by replay processing. For use in
  user interface / web API code, consider {@link #isDuplicateDigest()}
  is more appropriate.</p>
  @return {@code true} if revisit