3.2.1.4.3.2.9 PropID = 0x00000009 (CR_PROP_PARENTCA) "Parent CA Name"

The client has requested the name of the parent of the CA.

If the CA is a root CA, it has no parent and the server MUST return a non-zero error code.

If the CA implements the Config_CA_Parent_DNS datum, then the CA MUST return this name as a [UNICODE] string, through a CERTTRANSBLOB (section 2.2.2.2) structure. The format of the name SHOULD be Parent-FQDN + "\" + Parent-CommonName. Otherwise, the CA MUST return an empty string.

Marshaling rules for CERTTRANSBLOB are specified in section 2.2.2.2.