With quite some help from Ola (thanx!), I made good progress with the CMLRSS plugin . The current result looks like:

Screenshot of Bioclipse with an OPML file in the navigator on the left and some first extracted info.

A problem in the transition from Jumbo 5.0 to 5.1 is causing a problem so that it does not show a 3D model or 2D diagram, but that will follow soon.