How Do I Clean Up Errant Data using SPARQL Update Language? What? Cleaning up errant data using SPARQL Update Language.Why? All data endeavors involve varying degrees of prospective and retrospective error correction. How? Given a triple in a Virtuoso Quad store that contains an errant URI e.g. one that accidentally contains spaces, here is a SPARQL example that showcases how to delete said triple using a built-in function:DELETE FROM <your_graph> { `iri("http://isbsg.clearbluewater.com.au/wsf/datasets/378/Capers Jones_107_12122011081257")` a <http://isbsg.org/ontology/data/Dataset> }; Related Virtuoso Tips and Tricks Collection