Oxygen is an XML Editor and XSLT Debugger written in Java with Unicode support. It offers end tag auto-completion and a powerful code insight. The code insight can follow a DTD or an XML Schema or even can learn the structure from a partial edited document. An important thing is manipulating XML ontent and XSLT is the normal way to do this. XML and XSL documents can be easily associated one with the other and the transformation results can be viewed as text or HTML. Oxygen XML Editor provides a visual schema editor for W3C XML Schema and Relax NG schema designed to simplify the development and understanding of the schema files. Oxygen validates XML, XSL and XSD content, reporting errors with description and line number information. More documents can be logically organized in projects. It comes with the latest Docbook DTD and stylesheets. Includes the Apache FO Processor, being able to generate PDF and PostScript. Other FO processors can be configured as plugins. Oxygen provides a special layout when entering in debugging mode to show the source and the stylesheet documents side by side and to show also the results and special debbuging views. Debugging can be done using Xalan 2.5.1, Saxon6.5.3 or Saxon8 transformation engines. All debugger capabilities are provided (step into, step over, step out, run, run to cursor, run to end, pause, stop). XPath expressions are evaluated automatically during debugging. The output is dynamically presented as it is generated by the transformation process. A complete diff and merge solution is also available in Oxygen. It offers both directory and file comparison, 6 file diff algorithms, multiple level diff support, synchronized scrolling and change guide lines, easy invocation of the diff action from project panel or from the editors' contextual menu. Oxygen provides support for mporting database content, Microsoft Excel sheets and legacy text data files into XML documents.