* Gets the namespace URI for a model version.
     */
    private String getNamespaceForModelVersion(String modelVersion) {
        if (MavenPomElements.ModelVersions.MODEL_VERSION_4_2_0.equals(modelVersion)) {
            return MavenPomElements.Namespaces.MAVEN_4_2_0_NAMESPACE;
        } else if (MODEL_VERSION_4_1_0.equals(modelVersion)) {
            return MAVEN_4_1_0_NAMESPACE;
        } else {
            return MAVEN_4_0_0_NAMESPACE;

        String targetModel;
        if (options.modelVersion().isPresent()) {
            targetModel = options.modelVersion().get();
        } else if (options.all().orElse(false)) {
            targetModel = MODEL_VERSION_4_1_0;
        } else {
            targetModel = MavenPomElements.ModelVersions.MODEL_VERSION_4_0_0;
        }

        assertNotNull(xmlOutput, "Should produce XML output");
        assertTrue(xmlOutput.contains("<project"), "Should contain project element");
        assertTrue(xmlOutput.contains("<modelVersion>4.0.0</modelVersion>"), "Should contain modelVersion");
        assertTrue(xmlOutput.contains("<groupId>test</groupId>"), "Should contain groupId");
    }

    @Test
    void testElementOrderingInProject() throws Exception {

                    .modelVersion("4.1.0")
                    .groupId("com.example")
                    .artifactId("module-a")
                    .version("1.0.0")
                    .build();

            String moduleBPomXml = PomBuilder.create()
                    .namespace("http://maven.apache.org/POM/4.1.0")
                    .modelVersion("4.1.0")
                    .groupId("com.example")

            String pomXml = """
                <?xml version="1.0" encoding="UTF-8"?>
                <project xmlns="http://maven.apache.org/POM/4.0.0">
                    <modelVersion>4.0.0</modelVersion>
                    <groupId>test</groupId>
                    <artifactId>test</artifactId>
                    <version>1.0.0</version>
                    <build>
                        <plugins>

            assertTrue(ModelVersionUtils.isEligibleForInference(modelVersion));
        }

        @ParameterizedTest(name = "{0}")
        @ValueSource(strings = {"3.0.0", "5.0.0"})
        @DisplayName("should reject inference for unsupported version")
        void shouldRejectInferenceForUnsupportedVersions(String modelVersion) {

            String pomXml = """
                <?xml version="1.0" encoding="UTF-8"?>
                <project xmlns="http://maven.apache.org/POM/4.0.0">
                    <modelVersion>4.0.0</modelVersion>
                    <parent>
                        <groupId>com.example</groupId>
                        <artifactId>parent-project</artifactId>
                        <version>1.0.0</version>

            String pomXml = """
                <?xml version="1.0" encoding="UTF-8"?>
                <project xmlns="http://maven.apache.org/POM/4.0.0">
                    <modelVersion>4.0.0</modelVersion>
                    <dependencies>
                        <dependency>
                            <groupId>test</groupId>
                            <artifactId>test</artifactId>

        model = builder.build();
        String modelVersion = new MavenModelVersion().getModelVersion(model);
        if (!ModelBuilder.MODEL_VERSION_4_0_0.equals(modelVersion) && !preserveModelVersion) {
            warnNotDowngraded(project);
        }
        model = model.withModelVersion(modelVersion);

        return model;
    }

    /**
     * Applies model version inference optimization.
     * Removes modelVersion element when it can be inferred from namespace.
     */
    private boolean applyModelVersionInference(UpgradeContext context, Document pomDocument) {
        String currentVersion = ModelVersionUtils.detectModelVersion(pomDocument);

        // Only remove modelVersion for 4.1.0+ models where it can be inferred from namespace