LOG.debug("loading doc " + docUri);
doc = (DocumentImpl) broker.getXMLResource(docUri);
final NodeProxy node = new NodeProxy(doc, nodeId);
final Serializer serializer = broker.getSerializer();
serializer.reset();
serializer.setProperties(parameters);
final HashMap<String, Object> result = new HashMap<String, Object>();
VirtualTempFile vtempFile = new VirtualTempFile(MAX_DOWNLOAD_CHUNK_SIZE,MAX_DOWNLOAD_CHUNK_SIZE);
vtempFile.setTempPrefix("eXistRPCC");