Did you ever need to generate similar output via free/open source tools?
Answer: XSD Diagram (http://regis.cosnier.free.fr/?page=XSDDiagram).
When searching for the alternative couple years ago, that was my choice and I didn't regret since then,
Usage is very simple, let's see how works. I'll go step by step in a usage. For a real world example I use as a sample for the xsd the following one (standard web application descriptor schema): http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd
- Start XSDDiagram.exe and choose File -> Open (open the downloaded xsd file)
- Error is thrown: "Could not find file 'dir/web-common_3_0.xsd'."
- OK, so we need reffered xsds as well. Let's get the rest then (web-common_3_0.xsd, javaee_6.xsd, jsp_2_2.xsd and javaee_web_services_client_1_3.xsd).
- Copy them to the same dir and reopen the original xsd again.
- Click the button in toolbar "Add all toplevel elements"
or just choose the element you are interested in and click "Add selected toplevel element"
- Click multiple times (till all the levels are expanded) the button in toolbar "Expand one level"
or just click the + sign for those elements you're interested in.
- Choose File -> Export Diagram -> (choose the file type feasable for your use case, I chose svg) and save.
- You're done!
Output could look like this (please note that schema graphical representation in this case is huge):