Answer / tech3

Once you have declared the possible record types as field
groups and defined their structure, you can fill the extract
dataset using the following statements: EXTRACT. When the
first EXTRACT statement occurs in a program, the system
creates the extract dataset and adds the first extract
record to it. In each subsequent EXTRACT statement, the new
extract record is added to the dataset EXTRACT HEADER. When
you extract the data, the record is filled with the current
values of the corresponding fields. As soon as the system
has processed the first EXTRACT statement for a field group
, the structure of the corresponding extract record in the
extract dataset is fixed. You can no longer insert new
fields into the field groups and HEADER. If you try to
modify one of the field groups afterwards and use it in
another EXTRACT statement, a runtime error occurs. By
processing EXTRACT statements several times using different
field groups, you fill the extract dataset with records of
different length and structure. Since you can modify field
groups dynamically up to their first usage in an EXTRACT
statement, extract datasets provide the advantage that you
need not determine the structure at the beginning of the
program.

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