question: public void delete ( String name ) throws CertificateException , IOException { if ( name . equalsIgnoreCase ( NOT_BEFORE ) ) { notBefore = null ; } else if ( name . equalsIgnoreCase ( NOT_AFTER ) ) { notAfter = null ; } else { throw new CertificateException ( "Attribute name not recognized by" + " CertAttrSet:PrivateKeyUsage." ) ; } encodeThis ( ) ; }
target:  Delete the attribute value.