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Make distinction between //data informant// and //target informant// - refer to overview article.

There's amost always a mapping required; whether it's done in a TOOL script, a view or in the model.

===== Case 1 - Data informant used in model diagram =====

Some situations in which this occurs:
  * Data informant and target informant are common (no mapping required). If the informant is defined in the diagram then the source data can be imported immediately; otherwise, the informant must be defined.
  * Data informant and target informant are different, therefore mapping occurs in diagram.



===== Case 2 - Data informant mapped to target informant in script/view =====

Write and run script with this format:
<file>
Get informants from file
Export informants
</file>

Inspect informants, and create mappings. Grow script to:
<file>
Get informants from file
!Export informants (now optional)
Define mappings (from parameters or from external file)
Create/import data with data informants
Apply mappings
Export data
</file>

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