<oXygen/> gives you the possibility to apply a stylesheet for the current XML file. You can apply a stylesheet by pressing the   button (or CTRL+SHIFT+T) . Before doing that you have to configure the XSL transformation. Go to "Transformation Configuration" (the   button - or CTRL+SHIFT+T) and set the attributes for the XSLT section.

The XSLT section allows you to set a specific XSL URL for your current XML file. This file will be used to perform the XSLT transformation. More, there is the possiblity to configure some custom XSLT paramaters as well as specifying a URL header and footer for the result file.

Pay attention to the Output and FOP sections too. You can specify where the output should be stored and how it will be shown (as XHTML - with images relative to a given URL or as XML) or if you want or not a FOP transformation.

All the transformation settings are persistent.