XML Visualization tool?

Maybe this wasn't really what you were asking about but I was looking for a tool to generate user documentation for a Web Service, given the schema and/or wsdl. I tested 4 different tools for the job:

• Liquid XML studio
• XML Spy 2011
• DocumentX! 2011
• Stylus Studio 2011 XML Enterprise Suite

I was only looking for a tool to provide API documentation from the Web Service schema, disregarding any other feature any of the tools had. Me and my team all fell for the documentation/visualization that DocumentX! 2011 generated. It failed miserably to load my WSDL (some error message, maybe it cannot handle WSDLs?) but did a great job with the XSD. Each element/type has a:

1. Diagram
2. Concise text overview
3. References to where it's used
4. XSD source code section

What really made it stand out from the rest was the separation of diagram and overview. In XML Spy they are one and same which makes the diagram bigger. Liquid XML has a nice small diagram layout but lacks the overview completely. Stylus Studio instead has an XML sample where you have to click to see element documentation.

All the other tools have a lot of features for working with XML that DocumentX does not have. DocumentX is only a tool for documentation and that was what I was looking for.