ThemePart themePart = new ThemePart(new PartName("/ppt/theme/theme2.xml"));
// TODO: read it from a string instead
themePart.unmarshal(
FileUtils.openInputStream(new File(System.getProperty("user.dir") + "/theme2.xml"))
);
nmp.addTargetPart(themePart);
// 2. Notes slide
NotesSlidePart nsp = new NotesSlidePart();
Notes notes = (Notes)XmlUtils.unmarshalString(notesXML, Context.jcPML);
nsp.setJaxbElement(notes);