Convert a request_items parameter into the data structure
        required for Layer1.

def dynamize_request_items(self, batch_list):
        """
        Convert a request_items parameter into the data structure
        required for Layer1.
        """
        d = None
        if batch_list:
            d = {}
            for batch in batch_list:
                batch_dict = {}
                key_list = []
                for key in batch.keys:
                    if isinstance(key, tuple):
                        hash_key, range_key = key
                    else:
                        hash_key = key
                        range_key = None
                    k = self.build_key_from_values(batch.table.schema,
                                                   hash_key, range_key)
                    key_list.append(k)
                batch_dict['Keys'] = key_list
                if batch.attributes_to_get:
                    batch_dict['AttributesToGet'] = batch.attributes_to_get
            d[batch.table.name] = batch_dict
        return d