A sample accessibility plug-in for certain elements of the Logic Diagram sample plug-in project (contributed from the GEF plug-ins to Eclipse's New Project Wizard) are included in the installation of Jubula . You can import the sample accessibility plug-in into an Eclipse workspace in order to examine the general structure of such an accessibility plug-in (4.4)
The javadocs containing information about org.eclipse.jubula.rc.rcp.gef.identifier.IEditPartIdentifier and default implementations can be found in the Jubula installation directory under documentation/gefapi/javadoc.zip.