XML Visualization tool?

I've used several products. The ones that I can recommend are: SchemaAgent (http://www.altova.com/schemaagent.html) From their feature list: Connect to any file repository to analyze file relationships Visualize files as graphical components Immediately identify linked, referenced & related files Analyze file relationships based on color coded lines View details of displayed files (IIRs, global elements, namespaces, etc.) Drag & drop to manage IIR relationships between XSD, XSLT & WSDL files Automatically insert & save required IIR code in impacted files Build complex XSD, XSLT & WSDL files from smaller components Re-use standardized components in a modular development approach Access SchemaAgent schema components in XMLSpy schema editor Save & print graphical designs to document your XML information architecture Understand file dependencies & the impact of every change and XPathVisualiser (http://www.xml.com/pub/p/275) Disadvantage (at least in my eyes): requires MSXML3 and IE

On Windows http://symbolclick.com/ tries to do some visualizaton. It is also fast and light-weight. Too bad the project has stopped years ago. http://www.firstobject.com/dn_editor.htm is the fastest and ideal for my needs but it does not go as far as XML Marker in terms of visualization. On Linux http://kxmleditor.sourceforge.net is usable but not outstanding. Apart from the already mentioned XMLSpy, other commercial heavyweights include http://www.oxygenxml.com/, and http://www.stylusstudio.com/ which apart from visualization can do things like transformations, XSL debugging, WSDL, XPath, etc.

XMLMax, especially if the xml is large. very fast, color-coded treeview xpath query with results in treeview http://www.xponentsoftware.com

Maybe this wan'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: http://www.liquid-technologies.com http://www.altova.com http://www.innovasys.com http://www.stylusstudio.com 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: Diagram Concise text overview References to where it's used 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.