Virtuoso does not deal well with SPARQL queries that define the bif prefix. The line "PREFIX bif: http://www.openlinksw.com/schema/sparql/extensions#" should not be in a SPARQL query against a Virtuoso endpoint, or the server will throw an HTTP 400 error. Removing the bif prefix line solves the issue.
UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.77 Safari/537.36
Virtuoso does not deal well with SPARQL queries that define the bif prefix. The line "PREFIX bif: http://www.openlinksw.com/schema/sparql/extensions#" should not be in a SPARQL query against a Virtuoso endpoint, or the server will throw an HTTP 400 error. Removing the bif prefix line solves the issue.
UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.77 Safari/537.36