code: public void
  removeRecord(Record r) {
  	Name name = r.getName();
  	int rtype = r.getRRsetType();
  	synchronized (this) {
  		RRset rrset = findRRset(name, rtype);
  		if (rrset == null)
  			return;
  		if (rrset.size() == 1 && rrset.first().equals(r))
  			removeRRset(name, rtype);
  		else
  			rrset.deleteRR(r);
  	}
  }
docs: Removes a record from the Zone
  @param r The record to be removed
  @see Record