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Component Diagram conflicts

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Hello all,
What's the right way to represent a component in a deployment diagram when parts of that component are divided on seperate tiers? Example: The PetStore Customer component has some parts that are used not just on the middle/application tier, but also in the web tier (AccountModel, for instance). How is a component like that represented on a deployment diagram when the nodes correspond to individual physical pieces of equipment -- show the Customer component on *both* tiers, or just on the middle, or something else?
Also, in the book "UML Components", the authors state that a component exists strictly in the context of a Component Standard (e.g., Enterprise JavaBeans, COM+). So, that would imply that we are supposed to put only EJBs/JSPs/Servlets on the diagram. However, I have heard of people putting "groups of classes" (like a DAO + VO for a certain entity that doesn't have an EJB representing it), the Swing client/jar, and an XML document. By the previous definition, these items seem out of place... or are they?
Thanks in advance for your input,
[ January 25, 2002: Message edited by: David Carel ]
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