Link in ERD node?

[sabrael]

Is there a way to embed a link within an ERD node, similar to this for class diagrams? I haven't been able to find anything in the documentation, and adapting the syntax from other diagram types has not been successful. To clarify, I want the link in the node itself, not in the relationship label.

edit: Alternatively, is there some way to remove the middle and bottom compartments from class diagram nodes? I believe I could make class diagrams work for what I need, with some modifications. I'm able to remove the divider lines, resize the node, and reposition the link via css, but it's a bit clunky and I'm concerned about things lining up in other browsers, if I do everything manually.