Contains nodes that generate/create or write out DataTables. These nodes usually are instantiated at the beginning or the end of a data flow. There are reader nodes (like filereader, ARFFreader, etc.) that create data tables from files or any other source. The writer nodes (like CSVwriter, ARFFwriter, etc.) write out data tables that come in through their input ports. In addition there is the FileTokenizer which can be used to cut an ASCII stream into tokens.