Is there a method for those who don't have Visual Studio to see the DB structure? or using any other method but a screencapture (it is a huge diagram).
You may pick Diagram -> with a right-click on the design surface. You may export as an image to receive the whole created edmx model in bmp format.
This doesn't really work on large diagrams. Oh, it exports it, but when you zoom in on a big diagram, all the writing is just pixels. Although the flaw has been reported, Microsoft has no immediate plans to address it.
I just "printed" the paper to a pdf after downloading a pdf printer (like Bullzip free version).
No, to Viso. I haven't figured out how to export this to Visio yet.