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

Record formats

The records in a data set can have one of the following formats:

For a native file, you specify either undefined-length or fixed-length record format in the TYPE option of the DD information. You do not need to specify a record format for workstation VSAM data sets; they implicitly consist of varying-length records.

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