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for (Item i : collection) {
i.foo();
} 

In some abstract sequence diagrams you have a loop combined fragment with a condition along the lines of e.g. [for each item].

On a sequence diagram featuring Java implementation; what would you use as a loop guard?

If all lifelines must represent an object instance, how would you show that i: Item is not a single instance, but on each iteration a different object from the collection?

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