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This type of plugin contributes a folder that contains an external XProc engine.

The name of the plugin extension is AdditionalXprocEngine and it makes it easier to integrate an external XProc engine. After the plugin is installed, when you run an XProc transformation scenario, your external XProc engine can be selected from the Processor drop-down menu in the XProc tab.

An example of the plugin.xml file looks like this:
<plugin
 id="morgana.xproc.addon"
 name="Contribute Morgana XProc"
 description="Contribute Morgana XProc"
 version="1.0"
 vendor="SyncroSoft"
 class="ro.sync.exml.plugin.Plugin"
 classLoaderType="preferReferencedResources">
 <extension type="AdditionalXProcEngine" path="MorganaXProcEngine/"></extension>
</plugin>

The path attribute points to the XProc engine folder that contains the engine.xml and all the libraries necessary to run it.