oopumldata-modelingcardinality
Class diagram of category and sub-category
I have a simple relationship between product and category I came up with this diagram:
- A product can be assigned to 1 or many categories
- A category can have 0 or many sub-category
- A category can have 0 or 1 parent category
- When you delete a category the sub-categories still exist.
I want to be sure that the diagram has a correct cardinality, especially category to category relation.
Solution
Almost correct.
Use roles to clearly identify parent/sub-category along with their multiplicities. The hollow diamond makes it a shared aggregation which means the sub-category lives independent of its parent (else you would use a filled diamond).
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