]> http://www.w3.org/2007/rif-builtin-predicate#is-literal-boolean 1 http://www.w3.org/2007/rif-builtin-predicate#is-literal-not-boolean foo http://www.w3.org/2007/rif-builtin-predicate#is-literal-boolean http://www.w3.org/2001/XMLSchema#boolean 1 http://www.w3.org/2007/rif-builtin-predicate#boolean-equal 0 0 http://www.w3.org/2007/rif-builtin-predicate#boolean-less-than 0 1 http://www.w3.org/2007/rif-builtin-predicate#boolean-greater-than 1 0 http://example.org/example#ok