if (interpolatedModel.getParent() != null) {
            StringSearchInterpolator ssi = new StringSearchInterpolator();
            ssi.addValueSource(new MapBasedValueSource(request.getSession().getUserProperties()));
            ssi.addValueSource(new MapBasedValueSource(model.getProperties()));
            ssi.addValueSource(new MapBasedValueSource(request.getSession().getSystemProperties()));
            try {

        final ModelBuildingRequest request = new DefaultModelBuildingRequest()
                .setValidationLevel(validationLevel)
                .setLocationTracking(locationTracking)
                .setModelSource(new FileModelSource(pomFile));
        DefaultModelProblemCollector problems = new DefaultModelProblemCollector(new DefaultModelBuildingResult());
        try {

            // the defined parallism, while making sure the pool will not
            // be exhausted
            //
            return new ThreadPoolExecutor(
                    parallelism, Integer.MAX_VALUE, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<>()) {
                final AtomicInteger parked = new AtomicInteger();

                @Override
                public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)

            return new ActivationFrame(property, Optional.empty());
        }

        private <P> ActivationFrame nextFrame(String property, Function<P, InputLocationTracker> child) {
            @SuppressWarnings("unchecked")
            final Optional<P> parent = (Optional<P>) stk.peek().parent;
            return new ActivationFrame(property, parent.map(child));
        }

        assertEquals(
                new File(pom.getBasedir(), "target/classes/dir0"), new File((String) pom.getValue("properties/dir0")));
        assertEquals(new File(pom.getBasedir(), "src/test/dir1"), new File((String) pom.getValue("properties/dir1")));
        assertEquals(
                new File(pom.getBasedir(), "target/site/dir2"), new File((String) pom.getValue("properties/dir2")));
    }

    @Test

            return new ActivationFrame(property, Optional.empty());
        }

        private <P> ActivationFrame nextFrame(String property, Function<P, InputLocationTracker> child) {
            @SuppressWarnings("unchecked")
            final Optional<P> parent = (Optional<P>) stk.peek().parent;
            return new ActivationFrame(property, parent.map(child));
        }