Gio::File missing attribute definitions?

[Adam Nielsen <a nielsen shikadi net>]

Hi all,

Reading the documentation for Gio::File::get_basename() it says:

  If you want to use filenames in a user interface you should use the
  display name that you can get by requesting the
  FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME attribute with
  g_file_query_info()

I'm assuming this means Gio::File::query_info(), however
FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME is undefined and I can't work out
whether I have to call that something else as well, and if so, what.

There doesn't seem to be any other reference to it in the docs, and
even grepping the include files doesn't show any definitions.

Where is this one defined?

Many thanks,
Adam.