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6.2.26.2 Label Records
>_Workstation_> Under AIX, OS/2, and Windows, label processing is not supported. A warning message is issued if any of the following language elements are encountered:
If label records are specified for the file when the OPEN statement is executed, the labels are processed according to the standard label conventions, as follows:
INPUT files
The beginning labels are checked.
OUTPUT files
The beginning labels are written.
I-O files
The labels are checked; new labels are then written.
EXTEND files
The following procedures are executed:
  • Beginning file labels are processed only if this is a single-volume file.
  • Beginning volume labels of the last existing volume are processed as though the file was being opened with the INPUT phrase.
  • Existing ending file labels are processed as though the file was being opened with the INPUT phrase; they are then deleted.
  • Processing continues as if the file were opened as an OUTPUT file.
When label records are specified but not present, or are present but not specified, execution of the OPEN statement is unpredictable.

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