Comments on: Simple SPARQL Tutorial: SPARQL query … the OPTIONAL Graph Pattern https://ld4pe.dublincore.org/learning_resource/simple-sparql-tutorial-sparql-query-the-optional-graph-pattern/ Learning resources tagged by competency Tue, 27 Jun 2017 16:11:43 +0000 hourly 1 https://wordpress.org/?v=4.9.16