The systemd busctl on Ubuntu 20.04 doesn't like the xmlns:doc attribute that dbus-objects adds to the <node> element of the introspection XML. Just leaving out the attribute makes busctl happy.
Reproduction:
$ busctl introspect <interface> <path>
Unexpected <node> attribute xmlns:doc.
Dunno if you want to fix this, as I think the problem is really in busctl (at least, there are official-ish examples which indicate including xmlns:doc is perfectly valid: https://dbus.freedesktop.org/doc/dbus-api-design.html). Also, I don't know whether anyone besides me actually uses busctl, so it may not be worth doing anything about.
OTOH, the xmlns:doc attribute seems optional (at least, there are official-ish examples without it: https://dbus.freedesktop.org/doc/dbus-specification.html#introspection-format), so a fix is easy and AFAICT harmless.
The systemd
busctlon Ubuntu 20.04 doesn't like thexmlns:docattribute thatdbus-objectsadds to the<node>element of the introspection XML. Just leaving out the attribute makesbusctlhappy.Reproduction:
Dunno if you want to fix this, as I think the problem is really in
busctl(at least, there are official-ish examples which indicate includingxmlns:docis perfectly valid: https://dbus.freedesktop.org/doc/dbus-api-design.html). Also, I don't know whether anyone besides me actually usesbusctl, so it may not be worth doing anything about.OTOH, the
xmlns:docattribute seems optional (at least, there are official-ish examples without it: https://dbus.freedesktop.org/doc/dbus-specification.html#introspection-format), so a fix is easy and AFAICT harmless.