I believe the problem you have there is that you have nested namespaces and
there was a discussion sometime ago which said that GIR doesn't support it,
although I don't know if specifying the gir namespace should avoid it.
At that discussion (it's "Support for custom attribute
introspection/reflect
I'm seeing at GXml project (http://git.gnome.org/browse/gxml), and I
found that it uses two Namespaces to define its classes. But GXml
namespace don't have any class defined (yet), I suppose will be used
to define new modules after DOM is finished (may be XSD or others).
But when I try to generate
