Difference between revisions of "Help:SPARQL"
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PREFIX pdiops: <https://wiki.personaldata.io/prop/statement/> | PREFIX pdiops: <https://wiki.personaldata.io/prop/statement/> | ||
PREFIX pdiopq: <https://wiki.personaldata.io/prop/qualifier/>}} | PREFIX pdiopq: <https://wiki.personaldata.io/prop/qualifier/>}} | ||
| + | |||
| + | This replicates the same [https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format#Prefixes_used prefix scheme for Wikidata] (see also [https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#Basics_-_Understanding_Prefixes here]). | ||
== Example queries here == | == Example queries here == | ||
[[Category:Help]] | [[Category:Help]] | ||
Revision as of 20:31, 20 January 2020
SPARQL is the query language used by the query service.
You can read more about SPARQL here, on Wikidata. This has different parts:
- tutorial
- Building a Query examples
- very very very many examples on Wikidata -- this is the best way to learn, at least for me
- Wikidata Query Service user manual, which includes an explication of the 'label' service
- a description of the different views on results that are possible; note that each view expects the data to arrive for each row in a specific order as a tuple, even bound to a variable of fixed name
- a gentle introduction to the Wikidata Query Service
Specifics here
On this site, it is customary to use some prefixes:
PREFIX pdio: <https://wiki.personaldata.io/entity/>
PREFIX pdiot: <https://wiki.personaldata.io/prop/direct/>
PREFIX pdiop: <https://wiki.personaldata.io/prop/>
PREFIX pdiops: <https://wiki.personaldata.io/prop/statement/>
PREFIX pdiopq: <https://wiki.personaldata.io/prop/qualifier/>This replicates the same prefix scheme for Wikidata (see also here).