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As a structured writing format, DITA produces structured content (content that is annotated with specific structural and semantic information rather than with formatting information). To create a publication, your DITA map and its associated topics must be processed by a transformation script. That script is responsible for how the structural and semantic information in the DITA files is converted into formatting information for display.

Oxygen XML Editor publishes DITA content to various output sources using a bundled version of the DITA Open Toolkit. The DITA OT is an open-source publishing engine that can publish DITA content to various output sources such as XHTML, PDF, or Windows Help (CHM). Since it has a plugin-based architecture, it can be extended with extra plugins that either define new formats for conversion or customize an existing conversion format. You can run the DITA-OT from Oxygen XML Editor using a transformation scenario or you can run it directly from a command line: http://www.dita-ot.org/dev/topics/building-output.html.

The DITA-OT that comes bundled with Oxygen XML Editor contains more plugins than the standard DITA-OT that can be downloaded from their official website. For example, it contains pre-installed plugins for converting DITA content to Word, EPUB, WebHelp, or to publish to PDF using CSS to customize the output: http://blog.oxygenxml.com/2017/03/useful-dita-ot-plugins.html.