The required field accessor tells the transformer where it can find its data. Several strategies can be used for example defining a key or path as a location that points to a point in the data structure where information can be found. The found data will be used in the mapper.
The mapper is the part of the transformer that describes what to do with the data found by the accessor. A wide variety of mappers is offered to cast or convert data to a certain data type or to filter specific characters. Multiple mappers can be defined and will be applied in the order of definition.
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