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Modalities: FamilyHistory, presence and absence

A FamilyHistory can be of almost any phenomenon, e.g. family history of diabetes, family history of elevated blood pressure, family history of tumours. Similarly, any phenomenon can be absent or present, currently or in the past and with a variable degree of certainty. Such categories are constructed using modalities:

Modality which isModalityOf Phenomenon.

For example:

FamilyHistory which isFamilyHistoryOf Diabetes.

In addition, collections and sets are created using modalities, for example

(Multiple which isMultipleOf Spots) name Rash.

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