| How to define an external
key |
External
keys need special handling when defining the dictionary.
There are fundamentally two different type of External
keys that can be handled by the Visual Dictionary system,
those where the external key values can be found in the
data record fields and those where the external key is
independently derived. If the External key consists of data that
exists in the fields within the record, simply define the
fields in the external key with the same name, size, and
type. During the save sequence, the system will then
recognize these fields and assign them accordingly.
If the External key
consists of data that can not be found in the record,
simply define the external key using unique field name
and the system will define it as an independent field in
the file.
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