DMN.java

    public interface DecisionTable extends Expression {
        List<OutputClause> getOutput();
    }

    public interface OutputClause extends DMNElement {

    }

    public interface Expression extends DMNElement {

    }

    public interface DMNElement extends DMNModelInstrumentedBase {

    }

    public interface DMNModelInstrumentedBase {
        DMNModelInstrumentedBase getParent();

        void setParent(DMNModelInstrumentedBase parent);
    }

    @Test
    public void testParent() {
        String str =
                "import " + OutputClause.class.getCanonicalName() + "\n;" +
                "import " + DecisionTable.class.getCanonicalName() + "\n;" +
                "rule r\n" +
                "when\n" +
                "  $oc : OutputClause( parent instanceof DecisionTable, parent.output.size > 1 )\n" +
                "then\n" +
                "end\n";

        KieSession ksession = getKieSession( str );

        ksession.fireAllRules();

        assertTrue(true);
    }