code: public void
  addRecord(Record r) {
  	Name name = r.getName();
  	int rtype = r.getRRsetType();
  	synchronized (this) {
  		RRset rrset = findRRset(name, rtype);
  		if (rrset == null) {
  			rrset = new RRset(r);
  			addRRset(name, rrset);
  		} else {
  			rrset.addRR(r);
  		}
  	}
  }
docs: Adds a Record to the Zone
  @param r The record to be added
  @see Record