Currently all values to be printed have to be provided in the printjob.
A calculation engine should be implemented so you can derive a new field from other values.
The fields value should be dependant on other fields in the same label, from constant values (like date/time) or predefined fields (like label sequence number in the job).
In this engine there must be functions to do string manupuliation, convert between strings and numeric values like integers, money fields, and floats. Some data/time manipulation functions must be provided also.
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