I came across this, not sure if you've seen: http://files.wymeditor.org/wymeditor/trunk/src/examples/15-rdfa-editor.html
Discussion: http://forum.wymeditor.org/forum/viewtopic.php?f=3&p=2030"Being able to edit RDFa with WYMeditor is one of our current main priorities, and we've been working lately on implementing some missing methods, such as insert, wrap and unwrap, to e.g. support more inline elements, ..."
-Elias
