dag.addEdge(from.toString(), p.toString());
            return true;
        } catch (Graph.CycleDetectedException e) {
            problems.add(new DefaultModelProblem(
                    "Cycle detected between models at " + from + " and " + p,
                    ModelProblem.Severity.FATAL,
                    null,
                    null,
                    0,
                    0,
                    null,

            selected = getPathType(path);
            if (JavaPathType.CLASSES.equals(selected)) {
                selected = JavaPathType.PROCESSOR_CLASSES;
            } else if (JavaPathType.MODULES.equals(selected)) {
                selected = JavaPathType.PROCESSOR_MODULES;
            }
        }
        return Optional.ofNullable(selected);
    }

    /**

        MetadataGraphEdge res;

        res = policy.apply(e1, e2);
        assertEquals("1.1", res.getVersion(), "Wrong depth edge selected");

        res = policy.apply(e1, e3);
        assertEquals("1.2", res.getVersion(), "Wrong version edge selected");
    }
    // ------------------------------------------------------------------------------------------