[Telepathy] ANNOUNCE: telepathy-spec 0.17.21

[Simon McVittie]

I've uploaded telepathy-spec 0.17.21, the "no new parser yet" release.

The current development version of telepathy-spec is available as HTML:
  <http://telepathy.freedesktop.org/spec.html>
or from the 'master' branch in the git repository:
  <git://git.collabora.co.uk/git/telepathy-spec.git>
  <git+ssh://git.collabora.co.uk/git/telepathy-spec.git> (for committers)
  <http://git.collabora.co.uk/?p=telepathy-spec.git> (gitweb)

For packagers (e.g. http://packages.debian.org/telepathy-spec):
tar: http://telepathy.freedesktop.org/releases/telepathy-spec/telepathy-spec-0.17.21.tar.gz
sig: http://telepathy.freedesktop.org/releases/telepathy-spec/telepathy-spec-0.17.21.tar.gz.asc

API changes:

* It is now explicitly stated that removing the SelfHandle from a Group is the
  recommended way to depart gracefully. All connection managers should allow
  this (telepathy-glib 0.7.27 will have the necessary support code in
  TpGroupMixin).

Changes to experimental API:

* In ContactInfo the vCard TYPE type-parameter is represented as, for instance,
  "type=work" rather than just "work", and other type-parameters such as
  "language" are supported using similar syntax

* Tube parameters for outgoing tubes are now set when offering the tube, not
  when requesting it

* Generic Tube capabilities should be advertised on protocols like XMPP even
  if no client supports a particular tube type, to reduce the "barrier to
  entry" for Tube apps

New API:

* The new Message_Depart flag in Channel_Group_Flags indicates whether a
  message can be provided when departing from a Group

* ice-udp is available as an additional value for MediaSignalling channels'
  nat-traversal Telepathy property, and NAT_Traversal_ICE_UDP is a new
  channel-type-specific capability for StreamedMedia channels

Deprecations:

* The old (complex) Presence interface is deprecated in favour of
  SimplePresence; new client code should use SimplePresence, and connection
  managers with Presence should implement SimplePresence as soon as possible

Clarifications:

* Setting a status of type Offline, Unknown or Error for yourself is explicitly
  forbidden

(Version 0.17.19 was mistakenly tagged as telepathy-spec-0.17.20, so 0.17.20
was not used as a release version to avoid confusion.)

Regards,
    Simon
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