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. 2022 Aug 25;13:923528. doi: 10.3389/fimmu.2022.923528

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Copyright © 2022 Liang, Li, Dong and Chen

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Interface of MMKP knowledge entry. Each cell frame represents a judgement or a decision in the decision flow. (A) Each frame is identified by its table name and primary key, which is quoted by the polymorphic foreign key. (B) Only tables with a single unique key can be linked by polymorphic foreign keys. The MMKP tool will automatically create a unique self-incrementing key for each table record, and this key is marked in green. (C) The value of the polymorphic foreign key is definite and unique and is marked blue. Users can drag and drop to make connections between a polymorphic foreign key field and a table record. (D) Users can choose to display or hide the downstream tables as necessary by expanding the controller.