code: public boolean
  sameRRset(Record rec) {
  	return (getRRsetType() == rec.getRRsetType() &&
  		dclass == rec.dclass &&
  		name.equals(rec.name));
  }
docs: Determines if two Records could be part of the same RRset.
  This compares the name, type, and class of the Records; the ttl and
  rdata are not compared.