for (Folder f : parents) {
parentIds.add(ObjectId.toString(ObjectId.Type.OBJECT, f.getId()));
}
writer.setParents(parentIds);
writer.addMixinType(NodeType.MIX_REFERENCEABLE);
// document specific property conversation
cmisProperties(doc, writer);
writer.addChild(ObjectId.toString(ObjectId.Type.CONTENT, doc.getId()), JcrConstants.JCR_CONTENT);