]> x http://www.w3.org/2007/rif-builtin-predicate#is-literal-decimal x http://www.w3.org/2007/rif-builtin-function#numeric-subtract http://www.w3.org/2007/rif-builtin-function#numeric-multiply x http://www.w3.org/2007/rif-builtin-function#numeric-multiply x x x 0 http://example.org/example#root x