Creating UML sequence diagrams using UML Modeler

Has anyone tried to generate UML sequence diagrams using JDev's Modeler utility. Is there a workaround for creating sequence diagrams. Does Oracle have an very near-term plans for supporting sequence diagrams.
Thank you.
Antonio

While I've done a bit of work with UML, I'm by no means an expert, so this may be a dumb question...
Isn't the point of UML (and other modeling languages) to abstract the design of a system away from the implementation? I'm hard pressed to think of a situation where a UML diagram would change based on the language chosen for implementation.
Justin

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