The Runtime page shows all the packages that your plug-in makes visible to other plug-ins.
Press the Add... button in the Exported Packages section to add the com.example.xyz and com.example.xyz.actions packages to the list.
The Package Visibility section allows you to control on a per-package basis the visibility of your plug-in code to downstream plug-ins. Refer to the Access Restrictions document for full details.
The Classpath section is the place to declare the names of the libraries that constitute the plug-in classpath. Since JAR'd plug-ins are the recommended format for 3.1, it is recommended to leave this section blank.