Datavalues with complex structure (time, quantity, globecoordinate) have properties (e.g.
latitude, longitude, precision, amount, unit, etc.) that link from a node that is the
value of a statement, reference, or qualifier. In my question, I'm going to refer to
those nodes as "value nodes".
When performing a SPARQL query at the WD Query Service (example:
https://w.wiki/ptp),
these value nodes are identified by an IRI such as wdv: 742521f02b14bf1a6cbf7d4bc599eb77
(
http://www.wikidata.org/value/742521f02b14bf1a6cbf7d4bc599eb77). The local name part of
this IRI seems to be a hash of something. However, when I compare the hash values from the
snak JSON returned from the API for the same value node (see
https://gist.github.com/baskaufs/8c86bc5ceaae19e31fde88a2880cf0e9 for the example), the
hash associated with the value node (35976d7cb070b06a2dec1482aaca2982df3fedd4 in this
case) does not have any relationship to the local name part if the IRI for that value
node.
This situation differs from that of identifiers for references, whose IRIs
(wdref:8eb6208639efa82b5e7e4c709b7d18cbfca67411 =
http://www.wikidata.org/reference/8eb6208639efa82b5e7e4c709b7d18cbfca67411 in this
example) are clearly formed from the hash associated with the reference hash in the snak
JSON returned from the API (8eb6208639efa82b5e7e4c709b7d18cbfca67411).
I am using the JSON returned by the API after writing new data to track those data at a
later time via the Query Service. So I would like to know if there is a way that the value
node IRIs can be determined from information in the JSON returned from the API. This is
easy to do for reference and statement IRIs, but is not obvious for value nodes.
Thanks!
Steve Baskauf
--
Steven J. Baskauf, Ph.D.
Data Science and Data Curation Specialist
Jean & Alexander Heard Libraries, Vanderbilt University
Nashville, TN 37235, USA
Office: Eskind Biomedical Library, EMB 111
Phone: (615) 343-4582
https://my.vanderbilt.edu/baskauf/