You're both a developer and a content author. You need the complete XML development features and the visual XML-editing mode.

You're an XML content author. You want to edit content in text or visual mode using DITA, DocBook, or a customized framework, or just plain XML. You're not interested in XML development tasks, such as modifying stylesheets and schemas.

You're a developer. You create XML Schemas, develop XSLT stylesheets, XQuery, or XProc. You're not interested in visually editing XML.

You're a publisher. You need to automate the transformations of DITA/Docbook documents to WebHelp output for desktop and mobile devices, using command line scripts, outside of Oxygen XML Editor.

You're a developer who uses automated scripts. You need to do any of the following things using command line scripts, outside of Oxygen: (1) Automate the production of XML Schema documentation, XSLT Schema Documentation, or WSDL Schema Documentation, (2) Flatten an XML Schema, (3) Generate XML instances from XML Schemas, (4) Perform a validate and check for completeness operation on an entire DITA Map.