Hi Claus,
a brief partial reply:
On 13/08/13 16:20, Claus Stadler wrote:
...
For example, I notice that the Wikidata page for my
home town "Berndorf
in Lower Austria" does not contain the population:
http://www.wikidata.org/wiki/Q666615
This is because the Wikidata datatype for numbers is not implemented yet.
Looking at the corresponding DBpedia entry, this information actually
exists there:
http://dbpedia.org/resource/Berndorf,_Lower_Austria
The new DBpedia interface should offer a button next to the "population
8728" triple which enables transfer of this information to Wikidata.
To edit Wikidata, you should create an account. If you intend to do mass
edits, this account should be granted bot status first to avoid it from
being blocked if it sends a lot of requests. This is mostly a community
process: you should discuss the intended edit activities with the
community to find out if they are happy with this (this list is only
about the technical aspects). It is good to have additional inputs, but
I could imagine that most of the data gets bulk imported from Wikipedia
infoboxes by the community anyway, which is what happens with a lot of
data right now.
In another GSoC project, Hady Elsahar is working on mappings between the
wikidata RDF vocabulary and the DBpedia vocabulary.
This means, we can in principle map DBpedia RDF data to Wikidata RDF.
Note that there are some differences beyond the vocabulary. Most
Wikidata statements have source information attached, and there are also
qualifiers (not used heavily yet, since the selection/filtering
mechanisms of Wikidata are quite weak so far, but this will change). In
some domains, such as roles of actors in films, quantifiers are getting
widely used now; so this is not really triple data any more. But there
will be enough triple data left, I guess.
However, looking at the Wikidata API [2] there is
action=wbcreateclaim *
with the example:
api.php?action=wbcreateclaim&entity=q42&property=p9001&snaktype=novalue&token=foobar&baserevid=7201010
So the core question is, how can we map e.g. properties such as
wikidata:population (if that existed) to their respective Wikidata
property identifier (Q12345)?
This goes for any property that may occur in an RDF dump, such as:
http://www.wikidata.org/wiki/Special:EntityData/Q666615.nt
Note that all property ids start with a P. If it's of the form Q...,
then it is not a property.
Cheers,
Markus