XMLFox

XMLFox XML/XSD editor is the Windows based graphical tool for authoring, updating, exploring, well-formedness checking or validating XML documents. XMLFox is a graphical XML editing and validation tool for creating valid, well-formed XML documents and/or XSD Schema. It includes an XML View, XML Tree, XML Grid, and XML Script modes for editing, as well as extensive find capabilities for text and XML data. Additional features include XML and Schema Validation, standard editing features, XSD Schema building and more. XMLFox is an intuitive xml and xml schema (XSD) editor, allows the xml developer to create schemas and show a visual representation of what the xml document will look like for that schema.

The Professional Edition which isnt free provides a command-line interface for batch processing and more.