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  2. May 2022
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  5. Feb 2022
    1. Zusätzlich bietet die Abfragesprache SPARQL die Möglichkeit,RDF-kodierte semantische Daten strukturiert abzufragen, wobei bereits (beschränkter)Gebrauch der Möglichkeit logischer Schlussfolgerungen gemacht werden kann.

      SPARQL = Abfragesprache von RDF

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    1. sql use "http://triplr.org/sparyql/sparql.xml" as sparql; select * from sparql where query="PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT $nick $name FROM <http://www.dajobe.org/foaf.rdf> WHERE { $x a foaf:Person . $x foaf:nick $nick . $x foaf:name $name }" and service="http://sparql.org/sparql"

    1. ```xml <iq to='crschmidt@crschmidt.net/sparql' type='get' id='2'> <query xmlns='http://www.w3.org/2005/09/xmpp-sparql-binding'> SELECT ?a WHERE { ?a &http://xmlns.com/foaf/0.1/nick> "crschmidt". } </query> </iq>

      <iq to='crschmidt@crschmidt.net/sparql' type='result' id='2' from='crschmidt@crschmidt.net/sparql'> <query xmlns='http://www.w3.org/2005/09/xmpp-sparql-binding'> <meta /> <sparql xmlns='http://www.w3.org/2001/sw/DataAccess/rf1/result'> <head> <variable name='a'/> </head> <results> <result> </result> <result> </result> <result> </result> </results> </sparql> </query> </iq> ```

  6. Jan 2022
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  8. May 2021
    1. Note that variables cannot appear in the predicate position.
  9. Jun 2020
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  11. Nov 2019
  12. Jun 2019
    1. SPARQ

      SPARQL is an RDF query language—that is, a semantic query language for databases—able to retrieve and manipulate data stored in Resource Description Framework format

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  13. Nov 2018
    1. Now you know how to search for all works of art, or all buildings, or all human settlements: the magic incantation wdt:P31/wdt:P279*, along with the appropriate class. This uses some more SPARQL features that I haven’t explained yet, but quite honestly, this is almost the only relevant use of those features, so you don’t need to understand how it works in order to use WDQS effectively. If you want to know, I’ll explain it in a bit, but you can also just skip the next section and memorize or copy+paste wdt:P31/wdt:P279* from here when you need it.

      wdt:P31/wdt:P279* = magic incantation for Wikidata SPARQL to mean "instance of or subclass of"

  14. Oct 2018