public boolean
isAXFR() {
	return (rtype == Type.AXFR);
}
Returns true if the response is an AXFR-style response (List of Records).
This will be true if either an IXFR was performed, an IXFR was performed
and the server provided a full zone transfer, or an IXFR failed and
fallback to AXFR occurred.
src/main/java/core/org/xbill/DNS/ZoneTransferIn.java