Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

Data set organizations

The options of the PL/I ENVIRONMENT attribute that specify data set organization are:

Each is described in Specifying characteristics using the PL/I ENVIRONMENT attribute.

If you do not specify the data set organization option in the ENVIRONMENT attribute, it defaults to CONSECUTIVE.

Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide