+#define HC_XMPP_NS_BIND "urn:ietf:params:xml:ns:xmpp-bind"
+#define HC_XMPP_NS_SESSION "urn:ietf:params:xml:ns:xmpp-session"
+#define HC_XMPP_NS_DISCO "http://jabber.org/protocol/disco"
+#define HC_XMPP_NS_DISCO_INFO "http://jabber.org/protocol/disco#info"