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Data preprocessor used for preformatting a data.
A data preprocessor is used in cases where a value from a dataset or label must be displayed in another format or way than entered. This could for example be the need to display X-values as a date instead of 1, 2, 3, .. or even worse unix-timestamps. It could also be when a {@see Image_Graph_Marker_Value} needs to display values as percentages with 1 decimal digit instead of the default formatting (fx. 12.01271 -> 12.0%).
