Work continues on Dubbiya, the code-name for an in-browser entity-relationship diagram editor. There's now tooltips and relationships.
Let the mouse sit over a shape for a couple of seconds and you'll see a tooltip.
Type "Person-Address" into the "Quick Add" box, and you'll get two new entities, and a line between them:
Now type "Address-Country" into "Quick Add". Because Address already exists, only a Country entity is made. It is connected to the existing Address entity.