How to convert between datatypes using SPARQL in Virtuoso? To convert between datatypes using SPARQL in Virtuoso, one should use the following functions: xsd:boolean (in strg any) returns integer xsd:dateTime (in strg any) returns datetime xsd:double (in strg varchar) returns double precision xsd:float (in strg varchar) returns float xsd:integer (in strg varchar) returns integer Examples Related Virtuoso Tips and Tricks Collection Virtuoso Functions Guide