In the directory where <oXygen/> is installed there exists a directory
called plugins. This contains all the available plugins. In order for
<oXygen/> to use the new functionality you provided follow the next steps:
In the directory plugins
create a new directory, generally named after your plugin. For instance in the
uppercase plugin example this can be Uppercase.
Put in this new folder the plugin descriptor file, "plugin.xml" and the plugin
files.