t the widest use
            case possible, it does have certain limitations. </p>
    <ul>
      <li>iOS versions prior to 5.0 are not supported by the AWS Persistence Framework for Core Data.</li>
      <li>You cannot modify the hash key attribute once the object has been
      persisted to the Amazon DynamoDB table. Please delete the object and
      insert a new object instead of changing the hash key. When hash key
      attributes are modified, the save operation will fail and return an
      