Executes cURL request to a pre-defined endpoint of the EU Publications Office. Relies on elx_make_query to generate valid SPARQL queries
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elx_run_query( query = "", endpoint = "http://publications.europa.eu/webapi/rdf/sparql" )
A valid SPARQL query specified by 'elx_make_query' or manually
A data frame containing the results of the SPARQL query. Column 'work' contains the Cellar URI of the resource. Rows with even one missing variable are dropped.
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