true prefix oplsioc: prefix sioc: prefix foaf: select sum(?li+>tpch:lineextendedprice * ?li+>tpch:linediscount) as ?revenue from where { ?li a tpch:lineitem . filter ( (?li+>tpch:shipdate >= "1994-01-01"^^xsd:date) && (?li+>tpch:shipdate < bif:dateadd ("year", 1, "1994-01-01"^^xsd:date)) && (?li+>tpch:linediscount >= 0.06 - 0.01) && (?li+>tpch:linediscount <= 0.06 + 0.01) && (?li+>tpch:linequantity < 24) ) } ]]>http://demo.openlinksw.com/tpchsoft/sparql