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From: Andy Jefferson <andy@jpox.org>
Organization: Java Persistent Objects JDO
To: jdo-dev@db.apache.org
Subject: Re: Collections of interfaces
Date: Fri, 29 Apr 2005 19:59:48 +0100
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> Is it still required to use "implementation-classes" with a persistent
> field defined as an interface?

No. <implements> provides the default list of classes implementing an 
interface field, so you could just use that.

"implementation-classes" is there so that people can define (if they want) 
that a particular interface field accepts only specific implementation 
classes.

Hope that makes sense.

-- 
Andy
Java Persistent Objects JDO - JPOX