@Test
    public void testRecursiveNotQuery() {
        String drl =
                "import org.drools.compiler.xpath.Thing;\n" +
                "global java.util.List list\n" +
                "\n" +
                "rule \"Print all things contained in the Office\" when\n" +
                "    $office : Thing( name == \"office\" )\n" +
                "    isNotContainedIn( $office, thing; )\n" +
                "then\n" +
                "    list.add( thing.getName() );\n" +
                "end\n" +
                "\n" +
                "query isContainedIn( Thing $x, Thing $y )\n" +
                "    $y := Thing() from $x.getChildren()\n" +
                "or\n" +
                "    ( $z := Thing() from $x.getChildren() and isContainedIn( $z, $y; ) )\n" +
                "end\n" +
                "\n" +
                "query isNotContainedIn( Thing $x, Thing $y )\n" +
                "    not( isContainedIn( $x, $y; ) )\n" +
                "end\n";


        Thing house = new Thing( "house" );
        Thing office = new Thing( "office" );
        house.addChild( office );
        Thing kitchen = new Thing( "kitchen" );
        house.addChild( kitchen );

        Thing knife = new Thing( "knife" );
        kitchen.addChild( knife );
        Thing cheese = new Thing( "cheese" );
        kitchen.addChild( cheese );

        Thing desk = new Thing( "desk" );
        office.addChild( desk );
        Thing chair = new Thing( "chair" );
        office.addChild( chair );

        Thing computer = new Thing( "computer" );
        desk.addChild( computer );
        Thing draw = new Thing( "draw" );
        desk.addChild( draw );
        Thing key = new Thing( "key" );
        draw.addChild( key );

        KieSession ksession = new KieHelper().addContent( drl, ResourceType.DRL )
                                             .build()
                                             .newKieSession();

        List<String> list = new ArrayList<String>();
        ksession.setGlobal( "list", list );

        ksession.insert(house);
        ksession.insert(office);
        ksession.insert(kitchen);
        ksession.insert(knife);
        ksession.insert(cheese);
        ksession.insert(desk);
        ksession.insert(chair);
        ksession.insert(computer);
        ksession.insert(draw);
        ksession.insert(key);

        ksession.fireAllRules();
        System.out.println(list);
    }