About: http://webisa.webdatacommons.org/214954156

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	That makes it slow.There are a number of alternatives in SQL Server 2005, but your best bet is to upgrade to 2008, where the CONVERT function has been extended to perform this conversion natively.
http://www.w3.org/ns/prov#wasQuotedFrom	sqlservercentral.com