[Bug 692421] Can't see both 0.10 and 1.0 doc in devhelp

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692421
  GStreamer | common | git

--- Comment #3 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2013-01-24 21:01:10 UTC ---
I've tried various things today. At first Oliviers changes won't hurt and makes
things a little less special in our gtk-doc makefiles. Other projects like gtk
use e.g. DOC_MODULE=gtk{2,3}. If we do this, we have to rename a couple of
files though (gstreamer-docs.sgml -> gstreamer-1.0-docs.sgml). At that time we
could also rename them to xml :)

On the actual problem, neither the patch attached here, nor what I proposed in
#2 does fix the issue for me :/ I'll try to build devhelp myself and add some
diagnostics.

Olivier, why do you think it is caused by the <ONLINE href>-tag in index.sgml?
For example I can see gst-plugins-base-plugins for both 0.10 and 1.0, depite:

> head -n2 gst-plugins-base-plugins-{1.0,0.10}/index.sgml
==> gst-plugins-base-plugins-1.0/index.sgml <==
<ONLINE
href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base/html/">
<ANCHOR id="gst-plugins-base-plugins-adder"
href="gst-plugins-base-plugins-1.0/gst-plugins-base-plugins-adder.html">

==> gst-plugins-base-plugins-0.10/index.sgml <==
<ONLINE
href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base/html/">
<ANCHOR id="gst-plugins-base-plugins-adder"
href="gst-plugins-base-plugins-0.10/gst-plugins-base-plugins-adder.html">

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