Rational Developer for System z
PL/I for Windows, Version 7.6, Programming Guide

Additional data sets

Other types of data sets include varying-length, regional, and workstation VSAM data sets.

Varying-length data sets

Your PL/I program can also create and access data sets where each record has a two-byte prefix that specifies the number of bytes in the rest of the record. Unlike files with records delimited by CR - LF, these varying-length files can have records that possibly contain arbitrary bit patterns.

Regional data sets

A description of regional data sets and how you can use them is presented in Defining and using regional data sets.

Note:
Regional in this context means the same thing as REGIONAL(1) does in OS PL/I.

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