Each export file can be displayed as a sequence of operator blocks.

Each block is introduced by a begin operator and closed by the accompanying end operator. Between the begin and end operators there is a data section. This data section can also consist of a sequence of operator blocks.

The type of operator gives the operator block the following information:

• Number of operands
• Meaning of the operands
• Structure of the data section
• The structure of the data section is determined by the secondary file.

An export file can consist of the following operator blocks:

• Preamble block
• Personnel number block
• Payroll period block
• Postamble block