3.2.2.6.3.1.2 PropID=0x0000000A (CR_PROP_CATYPE) "CA Type"
The client has requested the type of the CA:
If the CA signing certificate that is stored in the Signing_Cert_Certificate column is a root certificate, the CA MUST return 0x00000000. Otherwise, the CA SHOULD return 0x00000001.
The CA MUST return its type through the CAType field of a CAINFO (section 2.2.2.4) structure. The server MUST return the CAINFO structure through a CERTTRANSBLOB structure.
Marshaling rules for the CERTTRANSBLOB structure are specified in 2.2.2.2.