Some basic UML questions

Posted by devoured elysium on Stack Overflow See other posts from Stack Overflow or by devoured elysium
Published on 2010-04-28T00:32:58Z Indexed on 2010/04/28 0:43 UTC
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What does it mean when you have something as the following picture? alt text

Each Customer has none, one or more Orders while each Order has only one Customer?

And in relationship to the following one: alt text

What does the black diamond mean in this context? How is that black diamond called?

Thanks

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