final String type = entry.getDeviceType();
serializer.startElement(NAMESPACE_UNKNOWN_DEVICES,
ELEMENT_NAME_DEVICE_TYPE, ELEMENT_NAME_DEVICE_TYPE,
EMPTY_ATTRIBUTES);
serializer.characters(type.toCharArray(), 0, type.length());
serializer.endElement(NAMESPACE_UNKNOWN_DEVICES,
ELEMENT_NAME_DEVICE_TYPE, ELEMENT_NAME_DEVICE_TYPE);
// serialize value
if (entry instanceof HeadersEntry) {
serializeHeadersEntry(serializer, (HeadersEntry) entry);