oXygen XML Editor is the best XML editor available and provides a comprehensive suite of XML authoring and development tools. It is designed to accommodate a large number of users, ranging from beginners to XML experts. It is available on multiple platforms, all major operating systems, and as a standalone application or an Eclipse plug-in. You can use oXygen XML Editor in conjunction with all XML-based technologies and it includes a large variety of powerful tools for creating, editing, and publishing XML documents.

This is an automatically synchronized tree-based Outline view. The document tree structure is presented as the document is edited. The modified element is revealed and selected in the Outline view. Also, an element can be selected in the editing window by clicking on the corresponding node in the Outline view. It uses a robust parser thus being able to handle correctly not well formed documents.