head.add( new DatavaluedPropertyAtom( quotient, x, z6 ) );
Rule rule = new Rule( head, body );
kb.addRule( rule );
kb.realize();
assertTrue( kb.hasPropertyValue( i, sum, sum11 ) );
assertTrue( kb.hasPropertyValue( i, sum, sum12 ) );
assertTrue( kb.hasPropertyValue( i, sum, sum22 ) );
assertTrue( kb.hasPropertyValue( i, difference, dif11 ) );
assertTrue( kb.hasPropertyValue( i, difference, dif12 ) );