I have eclipse 3.1 and i have install jbpm-gpd-site-3.0.5 plugin.
But when i open the gpd.xml file it want display the graphical view.
It shows the xml file only.
So how can i view gpd.xml file in Diagram view.
i had the same problem. After i install some more plugins it looks correct.
I think, it was the GEF plugin, who is require for the diagram view.
I hope, i could help you!