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HFEJB coffee cram page 60

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Hi All
The second question on page 60 says option B is nice but not guarenteed. But when I going thru' EJB2.0 spec page 25, 26 there this same feature is listed along with Container managed persistence etc. Are there features not guarenteed. Is it possible to have implimentation of the Spec without support for CM relations and finder query syntax etc. I am really confused as what are the guarenteed capabilities and what are features of EJB2.0
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