validateStringNotEmpty("modelVersion", problems, Severity.ERROR, Version.V20, m.getModelVersion(), m);

        validateModelVersion(problems, m.getModelVersion(), m, VALID_MODEL_VERSIONS);

        String minVersion = new MavenModelVersion().getModelVersion(m);
        if (m.getModelVersion() != null && compareModelVersions(minVersion, m.getModelVersion()) > 0) {
            addViolation(
                    problems,

        // Value taken from super model
        // ----------------------------------------------------------------------

        assertEquals("4.0.0", p4.getModelVersion());

        assertEquals("4.0.0", p4.getModelVersion());
    }

            }

            if (!model.isPreserveModelVersion()) {
                model = model.withPreserveModelVersion(false);
                String modelVersion = new MavenModelVersion().getModelVersion(model);
                model = model.withModelVersion(modelVersion);
            }
        } else if (BOM_PACKAGING.equals(packaging)) {
            DependencyManagement dependencyManagement =

        assertNull(builder.build().getModelVersion());

        model = Model.newBuilder().modelVersion("5.0.0").build();
        builder = Model.newBuilder(model);
        modelMerger.mergeModel_ModelVersion(builder, model, parent, false, null);
        assertEquals("5.0.0", builder.build().getModelVersion());
    }

    // ArtifactId is neither inherited nor injected
    @Test

        // Value taken from super model
        // ----------------------------------------------------------------------

        assertEquals("4.0.0", project4.getModelVersion());

        Build build = project4.getBuild();
        List<Plugin> plugins = build.getPlugins();

        Map<String, Integer> validPluginCounts = new HashMap<>();

        // Top-level elements
        // ----------------------------------------------------------------------

        assertEquals("4.0.0", project.getModelVersion());

        // ----------------------------------------------------------------------
        // Plugins
        // ----------------------------------------------------------------------

    //
    void handleModelVersion(ModelTransformerContext context, Model model, Path pomFile, Model.Builder builder) {
        String namespace = model.getNamespaceUri();
        if (model.getModelVersion() == null && namespace != null && namespace.startsWith(NAMESPACE_PREFIX)) {
            builder.modelVersion(namespace.substring(NAMESPACE_PREFIX.length()));
        }
    }

    //
    // Infer parent information

            }
            artifacts = result;
        }
        return artifacts;
    }

    void write(Model model, Path dest) throws IOException, XMLStreamException {
        String version = model.getModelVersion();
        Files.createDirectories(dest.getParent());
        try (Writer w = Files.newBufferedWriter(dest)) {
            MavenStaxWriter writer = new MavenStaxWriter();

        problems.setRootModel(inputModel);

        ModelData resultData = new ModelData(request.getSource(), inputModel);
        String superModelVersion = inputModel.getModelVersion() != null ? inputModel.getModelVersion() : "4.0.0";
        if (!VALID_MODEL_VERSIONS.contains(superModelVersion)) {
            // Maven 3.x is always using 4.0.0 version to load the supermodel, so

    public void setModelVersion(String pomVersion) {
        getModel().setModelVersion(pomVersion);
    }

    public String getModelVersion() {
        return getModel().getModelVersion();
    }

    public String getId() {
        return getModel().getId();
    }

    public void setGroupId(String groupId) {
        getModel().setGroupId(groupId);
    }