Jabber instant messaging technologies have long supported the ability for IM users to be online but appear invisible. The existing protocols for doing so are:
+Some instant messaging implementations of the Jabber/XMPP protocols have long supported the ability for IM users to be online but appear invisible. The existing protocols for doing so are:
&xep0018; -- this protocol is not compatible with &xmppcore; and &xmppim;, and the speciifcation does not provide reliable documentation of the protocol in use since many server implementations support presence of type "invisible" but not presence of type "visible".
&xep0126; -- this protocol is in many ways a mis-use of privacy lists for the temporary purpose of appearing invisible rather than the intended purpose of permanently blocking communications.
The ®ISTRAR; shall include 'http://www.xmpp.org/extensions/xep-0186.html#ns' in its registry of protocol namespaces (see &NAMESPACES;).
+Until this specification advances to a status of Draft, its associated namespace shall be "http://www.xmpp.org/extensions/xep-00186.html#ns"; upon advancement of this specification, the ®ISTRAR; shall issue a permanent namespace in accordance with the process defined in Section 4 of &xep0053;.