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Why "ejb-link" in "ejb-local-ref" is optional ?

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From the HFB mock exams, P.663 Q15 and the spec (p.466), why <ejb-link> is optional in <ejb-local-ref> ?

How to define "optional" ?

What happen during runtime if I have a <ejb-local-ref> elements but don't write the <ejb-link> ?
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I'm not really sure why they're optional. I think it has to do with the different "roles" involved in developing, packaging, and deploying an application. For the ejb-link, etc ... the spec officially says that by the time the app is deployed they need to be filled in. But, it's technically the job of the deployer "role"/person, so the developer doesn't really have much to do with it.

Then it gets messy with ejb-links to EJBs in other EARs, etc. Fun stuff. So I would imagine that it's optional so the file will validate, although the nodes should be there by the time it hits the container. I think.
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