code: public Classification setClassification(String classification) {
  		Classification prop = (classification == null) ? null : new Classification(classification);
  		setClassification(prop);
  		return prop;
  	}
docs: Sets the level of sensitivity of the journal entry. If not specified, the
  data within the journal entry should be considered "public".
  @param classification the classification level (e.g. "CONFIDENTIAL") or
  null to remove
  @return the property that was created
  @see <a href="http://tools.ietf.org/html/rfc5545#page-82">RFC 5545
  p.82-3</a>
  @see <a href="http://tools.ietf.org/html/rfc2445#page-79">RFC 2445
  p.79-80</a>