apiCanonMethod.setAlgorithm(modelCanonMethod.getAlgorithm());
apiSignedInfoType.setCanonicalizationMethod(apiCanonMethod);
// Signature Method
String sigAlg = modelSignedInfo.getSignatureMethod().getAlgorithm();
SignatureMethodType apiSigMethod = new SignatureMethodType();
apiSigMethod.setAlgorithm(sigAlg);
apiSignedInfoType.setSignatureMethod(apiSigMethod);
// References
List<Reference> modelReferenceList = modelSignedInfo.getReference();
List<ReferenceType> apiReferenceList = apiSignedInfoType.getReference();