*/
public Object set(int index, Object obj) {
SyndCategoryImpl sCat = (SyndCategoryImpl) obj;
DCSubject subject = (sCat != null) ? sCat.getSubject() : null;
DCSubject clonedSubject = new DCSubjectImpl();
clonedSubject.copyFrom(subject);
clonedSubject = (DCSubject) _subjects.set(index, clonedSubject);
return (clonedSubject != null) ? new SyndCategoryImpl(clonedSubject) : null;
}