public void startIXFRAdds(Record soa) {
		Delta delta = (Delta) ixfr.get(ixfr.size() - 1);
		delta.adds.add(soa);
		delta.end = getSOASerial(soa);
	}
Called for each content record in an AXFR.
@param r The DNS record.
src/main/java/core/org/xbill/DNS/ZoneTransferIn.java