public void
replace(Name name, int type, long ttl, String record) throws IOException {
	delete(name, type);
	add(name, type, ttl, record);
}
Parses a record from the string, and indicates that the record
should be inserted into the zone replacing any other records with the
same name and type.
@throws IOException The record could not be parsed.
src/main/java/core/org/xbill/DNS/Update.java