[Bug 345352] [API] query tag setters (and getters?) for supported tags

[GStreamer (bugzilla.gnome.org)]

http://bugzilla.gnome.org/show_bug.cgi?id=345352
  GStreamer | gstreamer (core) | git

--- Comment #7 from Meg Ford <meg387 at gmail.com> 2013-06-24 22:04:39 UTC ---
What about the second case, then, which is using it to determine whether a tag
is supported in the first place?

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