http://xmpp.org/rfcs/rfc3920.html#arch http://www.ht.sfc.keio.ac.jp/~takuro/blog/files/602a012759a8599e04fdf93baf860582-4.html #import 'libxml/tree.h' file not found - http://stackoverflow.com/questions/14622684/import-libxml-tree-h-file-n…