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What's the reason, and why didn't they just use URNs?
What's the reason, and why didn't they just use URNs?
I think the implication is meant to be "they look like URNs because they are".
The reason is because they're based off the same principle. "ARN" stands for "Amazon Resource Name".
I don't know why they didn't use URNs. Probably because nobody else does.