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For each externalForecastTimesCardinalTimeStep within externalForecastTimesSearchRelativePeriod, multiple external forecasts are requested to be imported. This way it is possible to import data for multiple (older) forecast times and not just the most recent. Only supported by specific impert import types, like WIWB.
table
Currently the generalCsv and Database import require a table layout description configured by the user. Non-standard imports (plugins) can also require a table layout. See the documentation of the specific import.
Table Layout
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