case EXPIRE_TIME:
return new SignatureExpirationTime(isCritical, data);
case REVOCABLE:
return new Revocable(isCritical, data);
case EXPORTABLE:
return new Exportable(isCritical, data);
case ISSUER_KEY_ID:
return new IssuerKeyID(isCritical, data);
case TRUST_SIG:
return new TrustSignature(isCritical, data);
case PREFERRED_COMP_ALGS: