According to its authors this software has a number of features:
- powerful XML and DTD editor with color syntax highlighting, element range navigation and context-dependent code-completing wizard;
- editing the DTD and XML using the tree and properties views, synchronized with the regular editor navigation;
- editing XML using state of the art Grid View and preview in the built-in browser window;
- on-demand and online validation for DTD schema and XML files against the underlying DTD schemas; auto-formatting the document;
- generation the DTD schema from XML file and sample XML file from the DTD;
- opening URL files as well as validation against the external DTD schemas.
You can get a copy of XML Pad from Download.com