oXygen XML Editor for Mac

From SyncRO Soft LTD:

Oxygen is a Java-based XML editor with support for XML, XSL, TXT, XSD and DTD documents. It has Unicode support and the interface messages are translated in English, French, German, Italian and Romanian. It offers end tag auto-completion and a powerful code insight that guide the user to write valid XML content. The code insight can follow a DTD or an XML Schema or even can learn the structure from a partial edited document, allowing the rest the document to be created faster.
An important thing is manipulating XML content 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 XHTML.
An XPath console is present to assist the user in testing the results of XPath expressions.
Oxygen validates XML, XSL, XML Schema and DTD content, reporting errors with description and line number information. More documents can be logically organized in projects. The syntax highlight can be customized. If the indentation is not right then the pretty print facility will solve this. Oxygen can run over the web through Java Web Start.
It comes with Docbook DTD and stylesheets. Includes the Apache FO Processor, being able to generate PDF and PostScript. Other FO processors can be configured as plugins.