[Bug 743406] New: Is GESTextOverlayClip not a GESExtractable anymore?

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743406
  GStreamer | gst-editing-services | git master

           Summary: Is GESTextOverlayClip not a GESExtractable anymore?
    Classification: Platform
           Product: GStreamer
           Version: git master
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-editing-services
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: polezhaiev at ukr.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


GES documentation
(http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESTextOverlayClip.html)
says:
>> GESTextOverlayClip implements GESExtractable and GESMetaContainer.
I want to use GESTextOverlayClip as asset in .xges file. May be thats wrong
idea, but I got error in _parse_asset function at ges/ges-xml-formatter.c:
...
  extractable_type = g_type_from_name (extractable_type_name);
  if (extractable_type == G_TYPE_NONE)
    g_set_error (error, G_MARKUP_ERROR,
        G_MARKUP_ERROR_INVALID_CONTENT,
        "element '%s' invalid extractable_type %s'",
        element_name, extractable_type_name);
  else if (!g_type_is_a (extractable_type, GES_TYPE_EXTRACTABLE))
    g_set_error (error, G_MARKUP_ERROR,
        G_MARKUP_ERROR_INVALID_CONTENT,
        "element '%s', %s not an extractable_type'",
        element_name, extractable_type_name); // I see this message
  else {
...
May be some kind of interface implementation error?

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