PKIX1 { }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
id-ce   keyIdentifier             [0] KeyIdtenifier             OPTIONAL }
    -- autholicyInformation :
SubjectKeyIdentifier ::= KeyIdentifier
id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
KeyUsage ::= BIT STRING {
     digitalSignature        (0),
     nonRe,
     notAfter        [fier
id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
KeyUsage ::= BIT STRING {
     digon
PolicyInformation ::= OPTIONAL {
    policyI$netifier   CertPolicyId,
     policyQualifiers   SEQUENCE SIZE (NAL }
   F
         