Buddy list URI proposal, revised slightly.

[C. Scott Ananian]

Rather than invent a new 'friend' URI scheme, an alternative is to use
the standard XMPP scheme:
  xmpp:xo at nickname.xxx.school.country.xs.laptop.org?roster;name=Full%20Name
(see http://www.xmpp.org/extensions/xep-0147.html )  (Thanks, Robert McQueen.)

The xmpp server on the laptop responds to roster and chat requests at
that address like a 'normal' jabber client, so that we interoperate
with iChat, etc.  When a school server is present, it may publish a
SRV record for _xmpp-server._tcp.nickname.xxx.school.country.xs.laptop.org
specifying that it is handling xmpp requests for that user.  (See
http://tools.ietf.org/html/rfc3921#page-88 ).

When attempting to connect to the xmpp server on an XO, we extend
rfc3921 in one regard: after (or in parallel with) attempting to
resolve the hostname via DNS, we hash it into a link-local address and
attempt to contact an xmpp server at that address.
  --scott

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