* of the expression pointed to by start_line_no and end_line_no
*
* @param context the returned expessions will be available in it.
- * expression_list_head, and expression_list_tail must be null,
- * otherwise GNUNET_NO will be returned
+ * expression_list_head and expression_list_tail must be NULL,
+ * otherwise GNUNET_NO will be returned
* @param file_name path to the file in which the expression in question exists
* @param start_line_no expression beginning line
* @param end_line_no expression end line