Rational Developer for System z
Enterprise COBOL for z/OS, Version 4.1, Programming Guide


Labels for QSAM files

You can use labels to identify magnetic tape and direct access volumes and data sets. The operating system uses label-processing routines to identify and verify labels and locate volumes and data sets.

There are two kinds of labels: standard and nonstandard. Enterprise COBOL does not support nonstandard user labels. In addition, standard user labels contain user-specified information about the associated data set.

Standard labels consist of volume labels and groups of data-set labels. Volume labels precede or follow data on the volume, and identify and describe the volume. The data-set labels precede or follow each data set on the volume, and identify and describe the data set.

related tasks  
Using trailer and header labels

related references  
Format of standard labels


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