code: public RRset []
  getSectionRRsets(int section) {
  	if (sections[section] == null)
  		return emptyRRsetArray;
  	List sets = new LinkedList();
  	Record [] recs = getSectionArray(section);
  	Set hash = new HashSet();
  	for (int i = 0; i < recs.length; i++) {
  		Name name = recs[i].getName();
  		boolean newset = true;
  		if (hash.contains(name)) {
  			for (int j = sets.size() - 1; j >= 0; j--) {
  				RRset set = (RRset) sets.get(j);
  				if (set.getType() == recs[i].getRRsetType() &&
  				    set.getDClass() == recs[i].getDClass() &&
  				    set.getName().equals(name))
  				{
  					set.addRR(recs[i]);
  					newset = false;
  					break;
  				}
  			}
  		}
  		if (newset) {
  			RRset set = new RRset(recs[i]);
  			sets.add(set);
  			hash.add(name);
  		}
  	}
  	return (RRset []) sets.toArray(new RRset[sets.size()]);
  }
docs: Returns an array containing all records in the given section grouped into
  RRsets.
  @see RRset
  @see Section