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Interface of the MMKP schema design. Three knowledge tables abstracted from the decision flow are shown, of which the cells from left to right refer to the field name, field type, manual annotation and polymorphic foreign key controller. The Type ‘Reference’ indicates that field ‘Next’ is a polymorphic foreign key. The Controller button from left to right adds the polymorphic foreign key link to its main table, to a new table, or shows the already-linked tables in the working canvas.
