Using AspectJ to extend an Entity

How can I use AspectJ to extend an Entity. For example say I have one entity Product with attributes like mfgDate,prodIdentifier. For some cases I would like to extend this entity to add new attributes like year,warranty.

Can I do this using AspectJ? The reason I want to do this is so that I can deliver the generic Product and then ask the other team to extend the generic product using开发者_StackOverflow Aspect.

Thanks

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I suppose you're talking about Inter-type Declarations.