fileName = collection.getName() + '/' + istream.readUTF();
	public void deserialize(byte[] data) {		VariableByteInputStream istream = new VariableByteInputStream(data);		try {			fileName = collection.getName() + '/' + istream.readUTF();			//children = istream.readInt();			documentRootId = istream.readLong();			docType = new DocumentTypeImpl();			((DocumentTypeImpl) docType).read(istream);		} catch(IOException e) {			LOG.warn("io error while writing document data", e);		}	}