// 3. Get [Content_Types].xml
ContentTypeManager ctm = p.getContentTypeManager();
org.w3c.dom.Document w3cDoc = XmlUtils.getNewDocumentBuilder().newDocument();
ctm.marshal( w3cDoc );
saveRawXmlPart(jcrSession, baseNode, "[Content_Types].xml", w3cDoc);
// 4. Start with _rels/.rels