code: @Override
      public XBELDocument unmarshal(File f) throws JAXBException, IOException {
          final Unmarshaller unmarshaller = createNewUnmashaller();
  
          FileInputStream fis = new FileInputStream(f);
          Reader reader = new InputStreamReader(fis, UTF_8);
          return (XBELDocument) unmarshaller.unmarshal(reader);
      }
docs: {@inheritDoc}