static Name
checkName(String field, Name name) {
	if (!name.isAbsolute())
		throw new RelativeNameException(name);
	return name;
}
Returns the name for which additional data processing should be done
for this record.  This can be used both for building responses and
parsing responses.
@return The name to used for additional data processing, or null if this
record type does not require additional data processing.
src/main/java/core/org/xbill/DNS/Record.java