J3/00-288 Date: 18 Sep 2000 To: J3 From: Dan Nagle Subject: Parent & Child I/O Modes A user specified derived type I/O procedure maybe called explicitly by the programmer or implicitly by a DT format specifier. It may be called from different data transfer statements which may be applying different formats, different units, different records, etc. Some of these items may be changed by the child but for others it makes no sense to allow changes. This paper sets ID, POS, and REC as unchangeable by a child data transfer routine. EDITS: 194:19+ add paragraph: A child data transfer statement shall not specify the ID=, POS=, or REC= specifiers in an I/O control list.