Given the following zone file,
@ A 127.0.0.1
x A 127.0.0.1 ; this line will
The zone parser will fail with the following error:
ParseZone: parse: parseRR: line 2: unknown class or type
Marking this as invalid because a space before RR has a meaning as describe by RFC 1035 section "5.1. Format" paragraph 4,
The last two forms represent RRs. If an entry for an RR begins with a blank, then the RR is assumed to be owned by the last stated owner. If an RR entry begins with a , then the owner name is reset.