Delete an item from a collection

        :param item_uri: the URI that references the item
        :type item_uri: String

        :rtype: String
        :returns: a message confirming that the metadata is modified

        :raises: APIError if the request was not successful

def delete_item(self, item_uri):
        """Delete an item from a collection

        :param item_uri: the URI that references the item
        :type item_uri: String

        :rtype: String
        :returns: a message confirming that the metadata is modified

        :raises: APIError if the request was not successful
        """

        response = self.api_request(item_uri, method='DELETE')
        return self.__check_success(response)