static void save(Shelf shelf, String file, EClass md5class) throws Exception { 
  EObject md5 = stringToMD5EObject("0x0abc", md5class); 
  Resource resource = createResource(file, md5class.getEPackage(), shelf.eClass().getEPackage());
  resource.getContents().add(md5); 
  resource.getContents().add(shelf); 
  resource.save(options());
}
static Resource createResource(String file, EPackage... packages) {
  ResourceSet resourceSet = new ResourceSetImpl();
  Resource.Factory factory = uri -> new BinaryResourceImpl(uri);
  resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("bin", factory); //file extension is .bin		
  for (EPackage p : packages) resourceSet.getPackageRegistry().put(p.getNsURI(), p);
  URI fileURI = URI.createFileURI(new File(file).getAbsolutePath());
  return resourceSet.createResource(fileURI);
}
static Map<String, Object> options() {
  return Collections.singletonMap(BinaryResourceImpl.OPTION_ZIP, Boolean.TRUE);
}