2.2.2.7.7.3 Encoding a Certificate Application Policy Extension
The OID for the Certificate Application Policy Extension is "1.3.6.1.4.1.311.21.10". The Certificate Application Policy Extension is encoded as a Certificate Policies extension (as specified in [RFC3280] section 4.2.1.5), with an instance of PolicyInformation for each given OID in which the policyIdentifier field is set to the OID and the policyQualifiers field is not present.