[AppStream] [fdo] Wikidata IDs in appdata.xml

[Matthias Klumpp]

2016-09-08 16:41 GMT+02:00 Richard Hughes <hughsient at gmail.com>:
> On 8 September 2016 at 15:36, Richard Hughes <hughsient at gmail.com> wrote:
>> I think that's a bad example; the gimp file is very incomplete.
>
> After debugging a bit... it's because you linked to an obsolete
> branch. https://github.com/GNOME/gimp/blob/master/desktop/gimp.appdata.xml.in
> shows what we ship now.

Thank you for that, I already added a task to investigate why GIMP
ships a bad file to my todo list ^^

2016-09-08 10:13 GMT+02:00 Loic Dachary <loic at dachary.org>:
> [...]
>> why you want this metadata piece in the files
>
> The Wikidata ID is a link to the http://wikidata.org/ item that contains facts about the software. Comparing the content of appdata.xml and wikidata would help users, wikidata editors and appdata.xml maintainers.
>
> The user (human or program) of https://github.com/GNOME/gimp/blob/gimp-2-8/desktop/gimp.appdata.xml.in has no information about the license. Using the Wikidata ID the license is found to be GPL-3.0 at https://www.wikidata.org/wiki/Q8038.

This wouldn't give more information than we already have in AppStream itself:
https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-project_license
And it would also add a potentially time-expensive web query.

Do you have a better example for this?

> The wikidata GNOME Builder item can reference the appdata.xml.in as the primary source of information regarding the license as shown in https://www.wikidata.org/w/index.php?title=Q20739542&type=revision&diff=374511744&oldid=374511702.
>
> The appdata.xml maintainer can harvest the descriptions translated into various languages from wikidata. For instance https://www.wikidata.org/wiki/Q20739542 has a french description that could be used in https://github.com/chergert/gnome-builder/blob/master/data/org.gnome.Builder.appdata.xml.in.

They could do that already by just manually looking at the page, could
they? Why does that require defining a new field for the ID?

>> It will also help a lot if you could point out a service or application that will consume this data
>
> Whatever application consumes appdata.xml could use Wikidata ID when a field is missing.

Can you give concrete examples on which fields are in Wikidata and not
in AppStream? And for these fields, I wonder whether it wouldn't make
sense to do as Richard suggested and add them to AppStream and
generate the Wikidata piece from the metainfo file...

Cheers,
    Matthias

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