How can I incorporate Content Negotiation into RDF bulk loaders? The examples from below demonstrate how to incorporate Content Negotiation into RDF bulk loaders: Using the UNKNOWN tag: http://www.w3.org/1999/xhtml:nowikiRDF_LOAD_RDFXML function: DB.DBA.RDF_LOAD_RDFXML (http_get ('http://purl.org/ontology/mo/', null, 'GET', 'Accept: application/rdf+xml', null, null, 3), 'http://purl.org/ontology/mo/', 'http://purl.org/ontology/mo/') . Using the TTLP function: The call to http client should be modified to ask for appropriate content type as for ex: DB.DBA.TTLP (http_get ('http://purl.org/ontology/mo/', null, 'GET', 'Accept: text/n3', null, null, 3), 'http://purl.org/ontology/mo/', 'http://purl.org/ontology/mo/'), '...', '...'); Related Virtuoso Tips and Tricks Collection RDF Insert Methods in Virtuoso