PKIX1 { }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
id-ce OBJECT IDENTIFIER  ::=  {joint-iso-ccitt(2) ds(5) 29}
id-ce-authorityKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 35 }
AuthorityKeyIdentifier ::= SEQUENCE {
      keyIdentifier             [0] KeyIdentifier            OPTIONAL,
      authorityCertIssuer       [1] GeperalNames             OPTIONAL,
      authorityCertSerialNumber [2] CertificateSerialNumber  OPTIONAL }
    -{3 2	6 0 - authorityCertIssuer and authorityCertSerialNumber shall both
    -- be present or bo digitalSignature        (0),
     nonRepudiation       @  (1),
     keyEncipherment     -privateKeyUsagePeriod OBrment        (3),
     keyAgreement            (4),
  TIONAL }
     -- either n. Before or not3 2After