Notes notes = (Notes)XmlUtils.unmarshalString(notesXML, Context.jcPML);
nsp.setJaxbElement(notes);
// .. connect it to the slide
slidePart.addTargetPart(nsp);
// .. it also has a rel to the slide
nsp.addTargetPart(slidePart);
// .. and the slide master
nsp.addTargetPart(nmp);