Explain cardinality & modality, Software Engineering

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Explain Cardinality & Modality?


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Cardinality: Requirement of the number of occurrences of one that can be related to number of occurrences of another.
Modality: The Modality of an association is 0 if there is no explicit need for the relationship to occur or the relationship is optional. The modality is 1 if an event of the relationship is mandatory.

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