code: public void addSubject(String[] subject) {
  		XmpArray array = new XmpArray(XmpArray.UNORDERED);
  		for (int i = 0; i < subject.length; i++) {
  			array.add(subject[i]);
  		}
  		setProperty(SUBJECT, array);
  	}
docs: Adds a subject.
  @param subject array of subjects