Hi!
Due to upgrade to more current version of Sesame toolkit, the format of
JSON output of Wikidata Query Service has changed slightly[1]. The
change is that plain literals (ones that do not have explicit data type,
like "string" or "string"@de) now have "datatype" field. The
language
literals will have type
http://www.w3.org/1999/02/22-rdf-syntax-ns#langString and the
non-language ones
http://www.w3.org/2001/XMLSchema#string. This is in
accordance with RDF 1.1 standard [2], where all literals have data type
(even though for these types it is implicit).
I apologize for not noting this in advance - though I knew this change
in the standard happened, I did not foresee it will also carry over to
the JSON output format. I am not sure yet which output form is actually
correct, since standards seem to be conflicting, maybe due to the fact
that JSON results standard hasn't been updated since 2013 and RDF 1.1 is
from 2014, so I will research which form is more correct. But for now I
would recommend to update the tools to recognize that these literals now
may have type. If I discover that the standards or accepted practices
recommend otherwise, I'll update further. You can also watch
https://phabricator.wikimedia.org/T225996 for final resolution of this.
[1]
https://phabricator.wikimedia.org/T225996
[2]
https://www.w3.org/TR/rdf11-concepts/#section-Graph-Literal
--
Stas Malyshev
smalyshev(a)wikimedia.org