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What does the UML aggregation symbol mean?

April 26, 2017aggregation mean symbol UML

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What does the UML aggregation symbol mean?

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Coming soon – a clarification and systematic way to use this symbol using Catalysis frameworks. There are too many loose interpretation about what the aggregation “diamond” means. Our view in Catalysis is that the notation is the least of the concerns; the interpretation is of essence. You can create a Catalysis framework for “every is lifetime-dependent on that instance which is its attribute”, and then use that as a stereotype on any association. Or, “every is inaccessible to any other object except through that instance which is its attribute”, and use that as another stereotype. Or, “once an gets into an relationship with a , it must remain with that same until it ceases to exist”. You can even combine stereotypes. And lastly, if you really find it convenient, you can define a particular diamond notation to mean a specific such interpretation and use it as a notational shorthand.