# Pastebin I88lC4x5
 Flags:  One octet containing the following field:

      Bit 0, Issuer Critical Flag:  If the value is set to "1", the
         Property is critical.  A CA MUST NOT issue certificates for any
         FQDN if the Relevant RRset for that FQDN contains a CAA
         critical Property for an unknown or unsupported Property Tag.