You can use XMLGrid's Online viewer which provides a great XSD support and many other features:
- Display XML data in an XML data grid.
- Supports XML, XSL, XSLT, XSD, HTML file types.
- Easy to modify or delete existing nodes, attributes, comments.
- Easy to add new nodes, attributes or comments.
- Easy to expand or collapse XML node tree.
- View XML source code.
Screenshot:
