Only one type of geometry (point, line, polyline...) can be stored per shapefile (this is a limitation of the shapefile format). This type will be detected automatically from the content of the input table. If several types are present, the writing will fail.
Other columns are written as attributes of the features, with an automatic conversion of classical KNIME types: String, Double, Long, Integer, Boolean. Other attribute types are mapped to String attributes.
Due to limitations of the shapefile format:
The actual processing is done by the wonderful geotools library.
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