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wikidata query service/qlever endpoint federated query #1077

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WolfgangFahl opened this issue Aug 30, 2023 · 1 comment · Fixed by #1105
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wikidata query service/qlever endpoint federated query #1077

WolfgangFahl opened this issue Aug 30, 2023 · 1 comment · Fixed by #1105

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@WolfgangFahl
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#588 needs some love after the Wikimedia folks have done their part according to Gehel.
@hannahbast
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hannahbast commented Sep 27, 2023 •
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@WolfgangFahl We have now implemented this in #1105 . The PR is not merged yet, but it's already live on https://qlever.cs.uni-freiburg.de/wikidata . For example:

curl -s https://qlever.cs.uni-freiburg.de/api/wikidata -H "Accept: application/sparql-results+xml" -H "Content-type: application/sparql-query" --data "PREFIX wd: <http://www.wikidata.org/entity/> SELECT * WHERE { VALUES (?country ?country_name ?mountain ?mountain_name ?height) { (wd:Q837 \"Nepal\"@en wd:Q513 \"Mount Everest\"@de 8850) } }"

and in comparison the (identical, up to formatting) result from WDQS:

curl -s https://query.wikidata.org/sparql -H "Accept: application/sparql-results+xml" -H "Content-type: application/sparql-query" --data "PREFIX wd: <http://www.wikidata.org/entity/> SELECT * WHERE { VALUES (?country ?country_name ?mountain ?mountain_name ?height) { (wd:Q837 \"Nepal\"@en wd:Q513 \"Mount Everest\"@de 8850) } }"

@hannahbast hannahbast mentioned this issue Oct 2, 2023
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hannahbast pushed a commit that referenced this issue Oct 2, 2023
@joka921
Support application/sparql-results+xml (#1105)
cc40054 
QLever can now also return the result as `application/sparql-results+xml`. Refactored the code, so that all exports except the two JSON exports (that is: CSV, TSV, Turtle, binary, and now also XML), use `ExportQueryExecutionTrees::selectQueryResultToStream` or `ExportQueryExecutionTrees::constructQueryResultToStream`. Fixes #1077
@WolfgangFahl WolfgangFahl mentioned this issue Jan 26, 2024
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Support application/sparql-results+xml joka921/QLever
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@WolfgangFahl @hannahbast