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commit b7ea8a459fb82fea0d47585f240b2f01294a4912
Author: Elliotte Rusty Harold <[email protected]>
AuthorDate: Sat Jul 19 07:07:59 2025 -0400

    revert namespace
---
 .../invoker/mvnup/goals/UpgradeConstants.java      |  6 ++---
 .../invoker/mvnup/goals/InferenceStrategyTest.java | 30 +++++++++++-----------
 .../mvnup/goals/ModelUpgradeStrategyTest.java      | 12 ++++-----
 .../invoker/mvnup/goals/ModelVersionUtilsTest.java |  6 ++---
 .../goals/UpgradeWorkflowIntegrationTest.java      |  2 +-
 .../src/test/resources/consumer/simple/pom.xml     |  4 +--
 .../consumer/simple/simple-parent/pom.xml          |  2 +-
 .../simple/simple-parent/simple-testutils/pom.xml  |  2 +-
 .../simple/simple-parent/simple-weather/pom.xml    |  2 +-
 .../simple/simple-parent/utils-parent/pom.xml      |  2 +-
 .../test/resources/consumer/trivial/child/pom.xml  |  2 +-
 .../src/test/resources/consumer/trivial/pom.xml    |  2 +-
 .../pom.xml                                        |  4 +--
 .../projects/subprojects-discover/child/pom.xml    |  2 +-
 .../projects/subprojects-discover/pom.xml          |  2 +-
 .../test/resources/projects/transform/before.pom   |  4 +--
 .../test/resources/projects/tree/consumer/pom.xml  |  2 +-
 .../src/test/resources/projects/tree/dep/pom.xml   |  2 +-
 .../src/test/resources/projects/tree/pom.xml       |  2 +-
 .../maven/impl/DefaultModelXmlFactoryTest.java     |  4 +--
 .../factory/props-and-profiles-grand-parent.xml    |  2 +-
 .../poms/factory/props-and-profiles-parent.xml     |  2 +-
 .../resources/poms/factory/props-and-profiles.xml  |  2 +-
 .../apache/maven/model/v4/MavenStaxReaderTest.java |  4 +--
 .../expected/parent-build.pom                      |  2 +-
 .../expected/simple-weather-build.pom              |  2 +-
 .../expected/simple-webapp-build.pom               |  2 +-
 .../test/resources/mng-6656-buildconsumer/pom.xml  |  2 +-
 .../mng-6656-buildconsumer/simple-parent/pom.xml   |  2 +-
 .../simple-parent/simple-weather/pom.xml           |  2 +-
 .../simple-parent/simple-webapp/pom.xml            |  2 +-
 .../expected/parent-build.pom                      |  2 +-
 .../expected/simple-parent-build.pom               |  2 +-
 .../expected/simple-testutils-build.pom            |  2 +-
 .../expected/simple-weather-build.pom              |  2 +-
 .../expected/simple-webapp-build.pom               |  2 +-
 .../expected/utils-parent-build.pom                |  2 +-
 .../test/resources/mng-6957-buildconsumer/pom.xml  |  2 +-
 .../mng-6957-buildconsumer/simple-parent/pom.xml   |  2 +-
 .../simple-parent/simple-testutils/pom.xml         |  2 +-
 .../simple-parent/simple-weather/pom.xml           |  2 +-
 .../simple-parent/simple-webapp/pom.xml            |  2 +-
 .../simple-parent/utils-parent/pom.xml             |  2 +-
 .../resources/mng-7038-rootdir/module-a/pom.xml    |  2 +-
 .../test/resources/mng-7228-leaky-model/pom.xml    |  2 +-
 .../mng-7255-inferred-groupid/child/pom.xml        |  2 +-
 .../mng-7255-inferred-groupid/dep/pom.xml          |  2 +-
 .../resources/mng-7255-inferred-groupid/pom.xml    |  2 +-
 .../test/resources/mng-7360-build-consumer/pom.xml |  2 +-
 .../mng-7804-plugin-execution-order/pom.xml        |  2 +-
 .../build-extension/pom.xml                        |  2 +-
 .../core-extension/pom.xml                         |  2 +-
 .../extension/pom.xml                              |  2 +-
 .../b/pom.xml                                      |  2 +-
 .../c/pom.xml                                      |  2 +-
 .../d/pom.xml                                      |  2 +-
 .../e/pom.xml                                      |  2 +-
 .../pom.xml                                        |  2 +-
 .../child/pom.xml                                  |  2 +-
 .../parent/pom.xml                                 |  2 +-
 .../test/resources/mng-8181-central-repo/pom.xml   |  2 +-
 .../extensions/extension1/pom.xml                  |  2 +-
 .../extensions/extension2/pom.xml                  |  2 +-
 .../extensions/extension3/pom.xml                  |  2 +-
 .../extensions/extension4/pom.xml                  |  2 +-
 .../mng-8220-extension-with-di/extensions/pom.xml  |  2 +-
 .../mng-8220-extension-with-di/test/pom.xml        |  2 +-
 .../cif-with-project-props/child/pom.xml           |  2 +-
 .../cif-with-project-props/pom.xml                 |  2 +-
 .../cif-with-user-props/child/pom.xml              |  2 +-
 .../cif-with-user-props/pom.xml                    |  2 +-
 .../exp-in-artifactid/pom.xml                      |  2 +-
 .../exp-in-groupid/pom.xml                         |  2 +-
 .../src/test/resources/mng-8244-phase-all/pom.xml  |  2 +-
 .../mng-8245-before-after-phase-all/pom.xml        |  2 +-
 .../bad-mismatch/child/pom.xml                     |  2 +-
 .../mng-8294-parent-checks/bad-mismatch/pom.xml    |  2 +-
 .../bad-non-resolvable/pom.xml                     |  2 +-
 .../mng-8294-parent-checks/bad-wrong-path/pom.xml  |  2 +-
 .../ok-using-empty/child/pom.xml                   |  2 +-
 .../mng-8294-parent-checks/ok-using-empty/pom.xml  |  2 +-
 .../ok-using-gav/child/pom.xml                     |  2 +-
 .../mng-8294-parent-checks/ok-using-gav/pom.xml    |  2 +-
 .../ok-using-path/child/pom.xml                    |  2 +-
 .../mng-8294-parent-checks/ok-using-path/pom.xml   |  2 +-
 .../module-a/pom.xml                               |  2 +-
 .../module-b/pom.xml                               |  2 +-
 .../pom.xml                                        |  2 +-
 .../resources/mng-8341-deadlock/child1/pom.xml     |  2 +-
 .../resources/mng-8341-deadlock/child2/pom.xml     |  2 +-
 .../resources/mng-8341-deadlock/parent/pom.xml     |  2 +-
 .../src/test/resources/mng-8341-deadlock/pom.xml   |  2 +-
 .../src/test/resources/mng-8360/module1/pom.xml    |  2 +-
 .../src/test/resources/mng-8360/pom.xml            |  2 +-
 .../mng-8383-unknown-type-dependencies/pom.xml     |  2 +-
 .../test/resources/mng-8385/spi-consumer/pom.xml   |  2 +-
 .../test/resources/mng-8385/spi-extension/pom.xml  |  2 +-
 .../pom-preserving.xml                             |  4 +--
 .../pom.xml                                        |  2 +-
 .../src/test/resources/mng-8465/pom.xml            |  2 +-
 .../src/test/resources/mng-8469/pom.xml            |  2 +-
 .../resources/mng-8525-maven-di-plugin/pom.xml     |  2 +-
 .../src/it/hello-maven-plugin/pom.xml              |  2 +-
 .../mng-8572-di-type-handler/extension/pom.xml     |  2 +-
 .../test/dummy-artifact-pom.xml                    |  2 +-
 .../mng-8572-di-type-handler/test/pom.xml          |  2 +-
 .../mng-8645-consumer-pom-dep-mgmt/pom.xml         |  2 +-
 .../src/test/resources/mng-8653/child-1/pom.xml    |  2 +-
 .../src/test/resources/mng-8653/child-2/pom.xml    |  2 +-
 .../src/test/resources/mng-8653/pom.xml            |  2 +-
 110 files changed, 139 insertions(+), 139 deletions(-)

diff --git 
a/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeConstants.java
 
b/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeConstants.java
index 8d49fcc76b..c2dc87910a 100644
--- 
a/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeConstants.java
+++ 
b/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeConstants.java
@@ -177,11 +177,11 @@ private Files() {
      * Maven namespace constants.
      */
     public static final class Namespaces {
-        /** Maven 4.0.0 namespace URI */
+        /** Maven namespace URI */
         public static final String MAVEN_4_0_0_NAMESPACE = 
"http://maven.apache.org/POM/4.0.0";;
 
-        /** Maven 4.1.0 namespace URI */
-        public static final String MAVEN_4_1_0_NAMESPACE = 
"http://maven.apache.org/POM/4.1.0";;
+        /** Maven namespace URI */
+        public static final String MAVEN_4_1_0_NAMESPACE = 
"http://maven.apache.org/POM/4.0.0";;
 
         private Namespaces() {
             // Utility class
diff --git 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/InferenceStrategyTest.java
 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/InferenceStrategyTest.java
index 766c30be58..85be99aee2 100644
--- 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/InferenceStrategyTest.java
+++ 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/InferenceStrategyTest.java
@@ -131,7 +131,7 @@ class DependencyInferenceTests {
         @DisplayName("should remove dependency version for project artifact")
         void shouldRemoveDependencyVersionForProjectArtifact() throws 
Exception {
             String parentPomXml = PomBuilder.create()
-                    .namespace("http://maven.apache.org/POM/4.1.0";)
+                    .namespace("http://maven.apache.org/POM/4.0.0";)
                     .modelVersion("4.1.0")
                     .groupId("com.example")
                     .artifactId("parent-project")
@@ -140,7 +140,7 @@ void shouldRemoveDependencyVersionForProjectArtifact() 
throws Exception {
                     .build();
 
             String moduleAPomXml = PomBuilder.create()
-                    .namespace("http://maven.apache.org/POM/4.1.0";)
+                    .namespace("http://maven.apache.org/POM/4.0.0";)
                     .modelVersion("4.1.0")
                     .parent("com.example", "parent-project", "1.0.0")
                     .artifactId("module-a")
@@ -149,7 +149,7 @@ void shouldRemoveDependencyVersionForProjectArtifact() 
throws Exception {
             String moduleBPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <parent>
                         <groupId>com.example</groupId>
                         <artifactId>parent-project</artifactId>
@@ -202,7 +202,7 @@ void shouldKeepDependencyVersionForExternalArtifact() 
throws Exception {
             String modulePomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <groupId>com.example</groupId>
                     <artifactId>my-module</artifactId>
                     <version>1.0.0</version>
@@ -237,7 +237,7 @@ void shouldKeepDependencyVersionForExternalArtifact() 
throws Exception {
         @DisplayName("should keep dependency version when version mismatch")
         void shouldKeepDependencyVersionWhenVersionMismatch() throws Exception 
{
             String moduleAPomXml = PomBuilder.create()
-                    .namespace("http://maven.apache.org/POM/4.1.0";)
+                    .namespace("http://maven.apache.org/POM/4.0.0";)
                     .modelVersion("4.1.0")
                     .groupId("com.example")
                     .artifactId("module-a")
@@ -245,7 +245,7 @@ void shouldKeepDependencyVersionWhenVersionMismatch() 
throws Exception {
                     .build();
 
             String moduleBPomXml = PomBuilder.create()
-                    .namespace("http://maven.apache.org/POM/4.1.0";)
+                    .namespace("http://maven.apache.org/POM/4.0.0";)
                     .modelVersion("4.1.0")
                     .groupId("com.example")
                     .artifactId("module-b")
@@ -283,7 +283,7 @@ void shouldHandlePluginDependencies() throws Exception {
             String moduleAPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <groupId>com.example</groupId>
                     <artifactId>module-a</artifactId>
                     <version>1.0.0</version>
@@ -293,7 +293,7 @@ void shouldHandlePluginDependencies() throws Exception {
             String moduleBPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <groupId>com.example</groupId>
                     <artifactId>module-b</artifactId>
                     <version>1.0.0</version>
@@ -350,7 +350,7 @@ void 
shouldRemoveParentGroupIdWhenChildDoesntHaveExplicitGroupId() throws Except
             String parentPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <groupId>com.example</groupId>
                     <artifactId>parent-project</artifactId>
@@ -361,7 +361,7 @@ void 
shouldRemoveParentGroupIdWhenChildDoesntHaveExplicitGroupId() throws Except
             String childPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <parent>
                         <groupId>com.example</groupId>
@@ -407,7 +407,7 @@ void shouldKeepParentGroupIdWhenChildHasExplicitGroupId() 
throws Exception {
             String parentPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <groupId>com.example</groupId>
                     <artifactId>parent-project</artifactId>
@@ -418,7 +418,7 @@ void shouldKeepParentGroupIdWhenChildHasExplicitGroupId() 
throws Exception {
             String childPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <parent>
                         <groupId>com.example</groupId>
@@ -459,7 +459,7 @@ void shouldNotTrimParentElementsWhenParentIsExternal() 
throws Exception {
             String childPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <parent>
                         <groupId>org.springframework.boot</groupId>
@@ -500,7 +500,7 @@ void shouldTrimParentElementsWhenParentIsInReactor() throws 
Exception {
             String parentPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <groupId>com.example</groupId>
                     <artifactId>parent-project</artifactId>
@@ -513,7 +513,7 @@ void shouldTrimParentElementsWhenParentIsInReactor() throws 
Exception {
             String childPomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <parent>
                         <groupId>com.example</groupId>
diff --git 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelUpgradeStrategyTest.java
 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelUpgradeStrategyTest.java
index 2a0c3c1719..10f1e404c3 100644
--- 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelUpgradeStrategyTest.java
+++ 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelUpgradeStrategyTest.java
@@ -176,15 +176,15 @@ private static Stream<Arguments> 
provideUpgradeScenarios() {
                             "http://maven.apache.org/POM/4.0.0";,
                             "4.0.0",
                             "4.1.0",
-                            "http://maven.apache.org/POM/4.1.0";,
+                            "http://maven.apache.org/POM/4.0.0";,
                             "4.1.0",
                             1,
                             "Should upgrade from 4.0.0 to 4.1.0"),
                     Arguments.of(
-                            "http://maven.apache.org/POM/4.1.0";,
+                            "http://maven.apache.org/POM/4.0.0";,
                             "4.1.0",
                             "4.1.0",
-                            "http://maven.apache.org/POM/4.1.0";,
+                            "http://maven.apache.org/POM/4.0.0";,
                             "4.1.0",
                             0,
                             "Should not modify when already at target 
version"),
@@ -192,7 +192,7 @@ private static Stream<Arguments> provideUpgradeScenarios() {
                             "http://maven.apache.org/POM/4.0.0";,
                             null,
                             "4.1.0",
-                            "http://maven.apache.org/POM/4.1.0";,
+                            "http://maven.apache.org/POM/4.0.0";,
                             "4.1.0",
                             1,
                             "Should add model version when missing"));
@@ -237,7 +237,7 @@ void shouldUpdateNamespaceRecursively() throws Exception {
 
             // Verify namespace was updated recursively
             Element root = document.getRootElement();
-            Namespace newNamespace = 
Namespace.getNamespace("http://maven.apache.org/POM/4.1.0";);
+            Namespace newNamespace = 
Namespace.getNamespace("http://maven.apache.org/POM/4.0.0";);
             assertEquals(newNamespace, root.getNamespace());
 
             // Verify child elements namespace updated recursively
@@ -334,7 +334,7 @@ void shouldFailWhenAttemptingDowngrade() throws Exception {
             String pomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <modelVersion>4.1.0</modelVersion>
                     <groupId>com.example</groupId>
                     <artifactId>test-project</artifactId>
diff --git 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelVersionUtilsTest.java
 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelVersionUtilsTest.java
index 215e6b8e48..d2226f017b 100644
--- 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelVersionUtilsTest.java
+++ 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/ModelVersionUtilsTest.java
@@ -75,7 +75,7 @@ void shouldDetectModelVersionFromDocument() throws Exception {
         @DisplayName("should detect 4.1.0 model version")
         void shouldDetect410ModelVersion() throws Exception {
             String pomXml = PomBuilder.create()
-                    .namespace("http://maven.apache.org/POM/4.1.0";)
+                    .namespace("http://maven.apache.org/POM/4.0.0";)
                     .modelVersion("4.1.0")
                     .groupId("test")
                     .artifactId("test")
@@ -111,7 +111,7 @@ void 
shouldDetectVersionFromNamespaceWhenModelVersionMissing() throws Exception
             String pomXml =
                     """
                 <?xml version="1.0" encoding="UTF-8"?>
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                     <groupId>test</groupId>
                     <artifactId>test</artifactId>
                     <version>1.0.0</version>
@@ -417,7 +417,7 @@ void shouldHandleMissingModelVersion() throws Exception {
         @ValueSource(
                 strings = {
                     "http://maven.apache.org/POM/4.0.0";,
-                    "http://maven.apache.org/POM/4.1.0";,
+                    "http://maven.apache.org/POM/4.0.0";,
                     "https://maven.apache.org/POM/4.0.0";,
                     "https://maven.apache.org/POM/4.1.0";
                 })
diff --git 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeWorkflowIntegrationTest.java
 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeWorkflowIntegrationTest.java
index 5a652d557f..354671a96f 100644
--- 
a/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeWorkflowIntegrationTest.java
+++ 
b/impl/maven-cli/src/test/java/org/apache/maven/cling/invoker/mvnup/goals/UpgradeWorkflowIntegrationTest.java
@@ -88,7 +88,7 @@ void shouldUpgradeModelVersionWith41Option() throws Exception 
{
             // Verify POM was upgraded
             String upgradedPom = Files.readString(pomFile);
             assertTrue(
-                    upgradedPom.contains("http://maven.apache.org/POM/4.1.0";),
+                    upgradedPom.contains("http://maven.apache.org/POM/4.0.0";),
                     "POM should be upgraded to 4.1.0 namespace");
         }
 
diff --git a/impl/maven-core/src/test/resources/consumer/simple/pom.xml 
b/impl/maven-core/src/test/resources/consumer/simple/pom.xml
index 73903014c1..baebc01e4b 100644
--- a/impl/maven-core/src/test/resources/consumer/simple/pom.xml
+++ b/impl/maven-core/src/test/resources/consumer/simple/pom.xml
@@ -17,8 +17,8 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project root="true" xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
-         xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project root="true" xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <groupId>org.sonatype.mavenbook.multi</groupId>
   <artifactId>parent</artifactId>
   <version>0.9-${changelist}-SNAPSHOT</version>
diff --git 
a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/pom.xml 
b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/pom.xml
index ef03c81f33..d72ea43698 100644
--- a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/pom.xml
+++ b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <groupId>org.sonatype.mavenbook.multi</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-testutils/pom.xml
 
b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-testutils/pom.xml
index 741f409447..202ae1b5b0 100644
--- 
a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-testutils/pom.xml
+++ 
b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-testutils/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <groupId>org.sonatype.mavenbook.multi</groupId>
     <artifactId>utils-parent</artifactId>
diff --git 
a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-weather/pom.xml
 
b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-weather/pom.xml
index 9b28b8d760..9a0db068a4 100644
--- 
a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-weather/pom.xml
+++ 
b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/simple-weather/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <groupId>org.sonatype.mavenbook.multi</groupId>
     <artifactId>simple-parent</artifactId>
diff --git 
a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/utils-parent/pom.xml
 
b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/utils-parent/pom.xml
index 1aa6b87d45..041156de2c 100644
--- 
a/impl/maven-core/src/test/resources/consumer/simple/simple-parent/utils-parent/pom.xml
+++ 
b/impl/maven-core/src/test/resources/consumer/simple/simple-parent/utils-parent/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <groupId>org.sonatype.mavenbook.multi</groupId>
     <artifactId>simple-parent</artifactId>
diff --git a/impl/maven-core/src/test/resources/consumer/trivial/child/pom.xml 
b/impl/maven-core/src/test/resources/consumer/trivial/child/pom.xml
index 25c05afa1d..297f5f4ba4 100644
--- a/impl/maven-core/src/test/resources/consumer/trivial/child/pom.xml
+++ b/impl/maven-core/src/test/resources/consumer/trivial/child/pom.xml
@@ -1,4 +1,4 @@
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <groupId>org.my.group</groupId>
     <artifactId>parent</artifactId>
diff --git a/impl/maven-core/src/test/resources/consumer/trivial/pom.xml 
b/impl/maven-core/src/test/resources/consumer/trivial/pom.xml
index c739cc33b9..6b741474f7 100644
--- a/impl/maven-core/src/test/resources/consumer/trivial/pom.xml
+++ b/impl/maven-core/src/test/resources/consumer/trivial/pom.xml
@@ -1,4 +1,4 @@
-<project root="true" xmlns="http://maven.apache.org/POM/4.1.0";>
+<project root="true" xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.my.group</groupId>
   <artifactId>parent</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/impl/maven-core/src/test/resources/projects/pom-parent-version-from-nested-properties/pom.xml
 
b/impl/maven-core/src/test/resources/projects/pom-parent-version-from-nested-properties/pom.xml
index dc232b74fa..5ab25adbd4 100644
--- 
a/impl/maven-core/src/test/resources/projects/pom-parent-version-from-nested-properties/pom.xml
+++ 
b/impl/maven-core/src/test/resources/projects/pom-parent-version-from-nested-properties/pom.xml
@@ -1,6 +1,6 @@
-<project xmlns="http://maven.apache.org/POM/4.1.0";
+<project xmlns="http://maven.apache.org/POM/4.0.0";
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
-         xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
http://maven.apache.org/xsd/maven-4.1.0.xsd";
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.1.0.xsd";
          root="true">
   <modelVersion>4.1.0</modelVersion>
 
diff --git 
a/impl/maven-core/src/test/resources/projects/subprojects-discover/child/pom.xml
 
b/impl/maven-core/src/test/resources/projects/subprojects-discover/child/pom.xml
index 4ec6c2320f..8f6112ffbc 100644
--- 
a/impl/maven-core/src/test/resources/projects/subprojects-discover/child/pom.xml
+++ 
b/impl/maven-core/src/test/resources/projects/subprojects-discover/child/pom.xml
@@ -1,4 +1,4 @@
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <groupId>subprojects-discover</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/impl/maven-core/src/test/resources/projects/subprojects-discover/pom.xml 
b/impl/maven-core/src/test/resources/projects/subprojects-discover/pom.xml
index 6567ad58f2..18ba46729b 100644
--- a/impl/maven-core/src/test/resources/projects/subprojects-discover/pom.xml
+++ b/impl/maven-core/src/test/resources/projects/subprojects-discover/pom.xml
@@ -1,4 +1,4 @@
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>subprojects-discover</groupId>
   <artifactId>parent</artifactId>
   <version>1</version>
diff --git a/impl/maven-core/src/test/resources/projects/transform/before.pom 
b/impl/maven-core/src/test/resources/projects/transform/before.pom
index 0fe4e3787c..483e329f29 100644
--- a/impl/maven-core/src/test/resources/projects/transform/before.pom
+++ b/impl/maven-core/src/test/resources/projects/transform/before.pom
@@ -19,9 +19,9 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<project xmlns="http://maven.apache.org/POM/4.1.0";
+<project xmlns="http://maven.apache.org/POM/4.0.0";
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
-         xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";
          root="true">
   <modelVersion>4.1.0</modelVersion>
 
diff --git a/impl/maven-core/src/test/resources/projects/tree/consumer/pom.xml 
b/impl/maven-core/src/test/resources/projects/tree/consumer/pom.xml
index 71597091b6..c527112307 100644
--- a/impl/maven-core/src/test/resources/projects/tree/consumer/pom.xml
+++ b/impl/maven-core/src/test/resources/projects/tree/consumer/pom.xml
@@ -1,4 +1,4 @@
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
 
     <parent>
         <groupId>org.apache.maven.ut</groupId>
diff --git a/impl/maven-core/src/test/resources/projects/tree/dep/pom.xml 
b/impl/maven-core/src/test/resources/projects/tree/dep/pom.xml
index 93a3f45ef6..09ccb88d1d 100644
--- a/impl/maven-core/src/test/resources/projects/tree/dep/pom.xml
+++ b/impl/maven-core/src/test/resources/projects/tree/dep/pom.xml
@@ -1,4 +1,4 @@
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
 
     <parent>
         <groupId>org.apache.maven.ut</groupId>
diff --git a/impl/maven-core/src/test/resources/projects/tree/pom.xml 
b/impl/maven-core/src/test/resources/projects/tree/pom.xml
index 98996f3a09..f9a69b4710 100644
--- a/impl/maven-core/src/test/resources/projects/tree/pom.xml
+++ b/impl/maven-core/src/test/resources/projects/tree/pom.xml
@@ -1,4 +1,4 @@
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
     <groupId>org.apache.maven.ut</groupId>
     <artifactId>parent</artifactId>
     <version>1.0-SNAPSHOT</version>
diff --git 
a/impl/maven-impl/src/test/java/org/apache/maven/impl/DefaultModelXmlFactoryTest.java
 
b/impl/maven-impl/src/test/java/org/apache/maven/impl/DefaultModelXmlFactoryTest.java
index 436d7b9798..68c18a5c98 100644
--- 
a/impl/maven-impl/src/test/java/org/apache/maven/impl/DefaultModelXmlFactoryTest.java
+++ 
b/impl/maven-impl/src/test/java/org/apache/maven/impl/DefaultModelXmlFactoryTest.java
@@ -59,7 +59,7 @@ void testValidNamespaceWithModelVersion400() throws Exception 
{
     void testValidNamespaceWithModelVersion410() throws Exception {
         String xml =
                 """
-                <project xmlns="http://maven.apache.org/POM/4.1.0";>
+                <project xmlns="http://maven.apache.org/POM/4.0.0";>
                   <modelVersion>4.1.0</modelVersion>
                 </project>""";
 
@@ -68,7 +68,7 @@ void testValidNamespaceWithModelVersion410() throws Exception 
{
 
         Model model = factory.read(request);
         assertEquals("4.1.0", model.getModelVersion());
-        assertEquals("http://maven.apache.org/POM/4.1.0";, 
model.getNamespaceUri());
+        assertEquals("http://maven.apache.org/POM/4.0.0";, 
model.getNamespaceUri());
     }
 
     @Test
diff --git 
a/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-grand-parent.xml
 
b/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-grand-parent.xml
index 2623069658..38ace4ff50 100644
--- 
a/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-grand-parent.xml
+++ 
b/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-grand-parent.xml
@@ -15,7 +15,7 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
     <groupId>org.apache.maven.tests</groupId>
     <artifactId>props-and-profiles-grand-parent</artifactId>
     <version>1.0-SNAPSHOT</version>
diff --git 
a/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-parent.xml 
b/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-parent.xml
index 00ffc6d0c9..59d4a2c5bc 100644
--- 
a/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-parent.xml
+++ 
b/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles-parent.xml
@@ -15,7 +15,7 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
     <parent>
         <relativePath>props-and-profiles-grand-parent.xml</relativePath>
     </parent>
diff --git 
a/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles.xml 
b/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles.xml
index 02fb63cfd0..2883dfda69 100644
--- a/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles.xml
+++ b/impl/maven-impl/src/test/resources/poms/factory/props-and-profiles.xml
@@ -15,7 +15,7 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
     <parent>
         <relativePath>props-and-profiles-parent.xml</relativePath>
     </parent>
diff --git 
a/impl/maven-support/src/test/java/org/apache/maven/model/v4/MavenStaxReaderTest.java
 
b/impl/maven-support/src/test/java/org/apache/maven/model/v4/MavenStaxReaderTest.java
index d88c3522e1..7630821e1c 100644
--- 
a/impl/maven-support/src/test/java/org/apache/maven/model/v4/MavenStaxReaderTest.java
+++ 
b/impl/maven-support/src/test/java/org/apache/maven/model/v4/MavenStaxReaderTest.java
@@ -69,7 +69,7 @@ void testNamespaceConsistency() throws XMLStreamException {
     @Test
     void testNamespaceInconsistencyThrows() {
         String xml = "<project xmlns=\"http://maven.apache.org/POM/4.0.0\";>\n"
-                + "  <build xmlns=\"http://maven.apache.org/POM/4.1.0\";>\n"
+                + "  <build xmlns=\"http://maven.apache.org/POM\";>\n"
                 + "    <plugins>\n"
                 + "      <plugin>\n"
                 + "        <artifactId>maven-test-plugin</artifactId>\n"
@@ -80,7 +80,7 @@ void testNamespaceInconsistencyThrows() {
 
         XMLStreamException ex = assertThrows(XMLStreamException.class, () -> 
fromXml(xml));
         assertTrue(ex.getMessage().contains("Unexpected namespace for element 
'build'"));
-        assertTrue(ex.getMessage().contains("found 
'http://maven.apache.org/POM/4.1.0'"));
+        assertTrue(ex.getMessage().contains("found 
'http://maven.apache.org/POM'"));
         assertTrue(ex.getMessage().contains("expected 
'http://maven.apache.org/POM/4.0.0'"));
     }
 
diff --git 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/parent-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/parent-build.pom
index 5cace7f2da..faf76a2c8f 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/parent-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/parent-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
     <groupId>org.sonatype.mavenbook.multi</groupId>
     <artifactId>parent</artifactId>
     <version>0.9-${changelist}-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-weather-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-weather-build.pom
index f5755d9da4..cbd3e9e2b4 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-weather-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-weather-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
   <parent />
   <artifactId>simple-weather</artifactId>
   <packaging>jar</packaging>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-webapp-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-webapp-build.pom
index 279a689ab7..c73bbbe970 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-webapp-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/expected/simple-webapp-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
   <parent />
 
   <artifactId>simple-webapp</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/pom.xml 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/pom.xml
index a2886e367f..1450298867 100644
--- a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
   <groupId>org.sonatype.mavenbook.multi</groupId>
   <artifactId>parent</artifactId>
   <version>0.9-${changelist}-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/pom.xml
index 11ef77ac40..66afea3cbb 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
   <parent />
   <artifactId>simple-parent</artifactId>
   <packaging>pom</packaging>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-weather/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-weather/pom.xml
index f5755d9da4..cbd3e9e2b4 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-weather/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-weather/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
   <parent />
   <artifactId>simple-weather</artifactId>
   <packaging>jar</packaging>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-webapp/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-webapp/pom.xml
index 279a689ab7..c73bbbe970 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-webapp/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6656-buildconsumer/simple-parent/simple-webapp/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/maven-v4_1_0.xsd";>
   <parent />
 
   <artifactId>simple-webapp</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/parent-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/parent-build.pom
index e4713ea4fd..880897c5a6 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/parent-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/parent-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <groupId>org.sonatype.mavenbook.multi</groupId>
   <artifactId>parent</artifactId>
   <version>0.9-${changelist}-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-parent-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-parent-build.pom
index 87e8ac1100..34c68ce4db 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-parent-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-parent-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <groupId>org.sonatype.mavenbook.multi</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-testutils-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-testutils-build.pom
index b9e9b5efe3..59db1cd565 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-testutils-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-testutils-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <relativePath>../utils-parent</relativePath>
   </parent>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-weather-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-weather-build.pom
index 7da8409ef3..8845306fde 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-weather-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-weather-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent />
   <artifactId>simple-weather</artifactId>
   <packaging>jar</packaging>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-webapp-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-webapp-build.pom
index 30e55e7df7..ea8f4086c1 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-webapp-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/simple-webapp-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent />
 
   <artifactId>simple-webapp</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/utils-parent-build.pom
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/utils-parent-build.pom
index fb8c07c2d1..8d0df3c966 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/utils-parent-build.pom
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/expected/utils-parent-build.pom
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent />
   <artifactId>utils-parent</artifactId>
   <packaging>pom</packaging>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/pom.xml 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/pom.xml
index e4713ea4fd..880897c5a6 100644
--- a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <groupId>org.sonatype.mavenbook.multi</groupId>
   <artifactId>parent</artifactId>
   <version>0.9-${changelist}-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/pom.xml
index 87e8ac1100..34c68ce4db 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <groupId>org.sonatype.mavenbook.multi</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-testutils/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-testutils/pom.xml
index b9e9b5efe3..59db1cd565 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-testutils/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-testutils/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent>
     <relativePath>../utils-parent</relativePath>
   </parent>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-weather/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-weather/pom.xml
index 7da8409ef3..8845306fde 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-weather/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-weather/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent />
   <artifactId>simple-weather</artifactId>
   <packaging>jar</packaging>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-webapp/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-webapp/pom.xml
index 30e55e7df7..ea8f4086c1 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-webapp/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/simple-webapp/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent />
 
   <artifactId>simple-webapp</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/utils-parent/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/utils-parent/pom.xml
index fb8c07c2d1..8d0df3c966 100644
--- 
a/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/utils-parent/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-6957-buildconsumer/simple-parent/utils-parent/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <parent />
   <artifactId>utils-parent</artifactId>
   <packaging>pom</packaging>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7038-rootdir/module-a/pom.xml 
b/its/core-it-suite/src/test/resources/mng-7038-rootdir/module-a/pom.xml
index 6ca592c683..59561a6df5 100644
--- a/its/core-it-suite/src/test/resources/mng-7038-rootdir/module-a/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-7038-rootdir/module-a/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
 
   <parent>
     <groupId>org.apache.maven.its.mng7038</groupId>
diff --git a/its/core-it-suite/src/test/resources/mng-7228-leaky-model/pom.xml 
b/its/core-it-suite/src/test/resources/mng-7228-leaky-model/pom.xml
index 2d620dc7e9..9df5d6c7cb 100644
--- a/its/core-it-suite/src/test/resources/mng-7228-leaky-model/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-7228-leaky-model/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng7228</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/child/pom.xml 
b/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/child/pom.xml
index 85d1a5d4c0..8ebedb336c 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <groupId>org.apache.maven.its.mng7255</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/dep/pom.xml 
b/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/dep/pom.xml
index 0f1b35a502..697f50b16b 100644
--- a/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/dep/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/dep/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <groupId>org.apache.maven.its.mng7255</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/pom.xml 
b/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/pom.xml
index 4c0d0ccfd3..aedd9698e3 100644
--- a/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-7255-inferred-groupid/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng7255</groupId>
   <artifactId>parent</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7360-build-consumer/pom.xml 
b/its/core-it-suite/src/test/resources/mng-7360-build-consumer/pom.xml
index 127b9cbd2b..3990c402b3 100644
--- a/its/core-it-suite/src/test/resources/mng-7360-build-consumer/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-7360-build-consumer/pom.xml
@@ -17,7 +17,7 @@
     limitations under the License.
 
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
http://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <groupId>org.apache.maven.its.mng7360</groupId>
   <artifactId>parent</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7804-plugin-execution-order/pom.xml 
b/its/core-it-suite/src/test/resources/mng-7804-plugin-execution-order/pom.xml
index c94a8dfdd3..b12c0f4d21 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7804-plugin-execution-order/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7804-plugin-execution-order/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
http://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.1.0.xsd";>
 
   <groupId>mng7804</groupId>
   <artifactId>plugin-execution-order</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/build-extension/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/build-extension/pom.xml
index 951402ade6..7d12f9e5fb 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/build-extension/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/build-extension/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng7891</groupId>
   <artifactId>build-extension</artifactId>
   <version>0.0.1-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/core-extension/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/core-extension/pom.xml
index 248798ee3a..781557c1d4 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/core-extension/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/core-extension/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng7891</groupId>
   <artifactId>core-extension</artifactId>
   <version>0.0.1-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/extension/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/extension/pom.xml
index d145a989ec..0d2ca4eec8 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/extension/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7891-extension-configuration/extension/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng7891</groupId>
   <artifactId>extension</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/b/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/b/pom.xml
index 80a68acb29..10a1c564a9 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/b/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/b/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent />
 
   <groupId>org.apache.maven.its.mng7982</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/c/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/c/pom.xml
index 1f36022d61..38ce3156fa 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/c/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/c/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent />
 
   <groupId>org.apache.maven.its.mng7982</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/d/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/d/pom.xml
index 19306ca154..696df1ea93 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/d/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/d/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent />
 
   <groupId>org.apache.maven.its.mng7982</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/e/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/e/pom.xml
index 6f5e567489..08fdcd65e4 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/e/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/e/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent />
 
   <groupId>org.apache.maven.its.mng7982</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/pom.xml
index 74737a491d..3d16a49d35 100644
--- 
a/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-7982-transitive-dependency-management/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng7982</groupId>
   <artifactId>test</artifactId>
   <version>0.1</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/child/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/child/pom.xml
index cd44675d64..757e2852dc 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <groupId>org.apache.maven.its.mng8133</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/parent/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/parent/pom.xml
index a3fab582a1..164cd97f01 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/parent/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8133-root-directory-in-parent/parent/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng8133</groupId>
   <artifactId>parent</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git a/its/core-it-suite/src/test/resources/mng-8181-central-repo/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8181-central-repo/pom.xml
index 51913cb003..5be32d6ae5 100644
--- a/its/core-it-suite/src/test/resources/mng-8181-central-repo/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8181-central-repo/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <modelVersion>4.1.0</modelVersion>
 
   <parent>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension1/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension1/pom.xml
index c9a04440bf..99aa0000d7 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension1/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension1/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng8220</groupId>
   <artifactId>extension1</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension2/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension2/pom.xml
index fe30147d85..e6c28ef79d 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension2/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension2/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng8220</groupId>
   <artifactId>extension2</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension3/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension3/pom.xml
index 9863e5096f..7349bc3661 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension3/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension3/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng8220</groupId>
   <artifactId>extension3</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension4/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension4/pom.xml
index 7f1c50f0dd..d11b41e910 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension4/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/extension4/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng8220</groupId>
   <artifactId>extension4</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/pom.xml
index d5162b99ec..4c4076b8b2 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/extensions/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng8220</groupId>
   <artifactId>parent</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/test/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/test/pom.xml
index 4a7ac6264c..e0d12c5489 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/test/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8220-extension-with-di/test/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <groupId>org.apache.maven.its.mng8220</groupId>
   <artifactId>extension</artifactId>
   <version>1.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/child/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/child/pom.xml
index c616a634d6..0594552911 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <modelVersion>4.1.0</modelVersion>
   <parent />
   <artifactId>child</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/pom.xml
index 79f7f87d06..adf81f0d81 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-project-props/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>myGroup</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/child/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/child/pom.xml
index c616a634d6..0594552911 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <modelVersion>4.1.0</modelVersion>
   <parent />
   <artifactId>child</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/pom.xml
index fca8940a59..363e47c27c 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/cif-with-user-props/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>myGroup</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-artifactid/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-artifactid/pom.xml
index c47e5b1bd2..e65ab80c07 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-artifactid/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-artifactid/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>myGroup</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-groupid/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-groupid/pom.xml
index a3b08ae313..775c95bb56 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-groupid/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8230-ci-friendly-and-gav/exp-in-groupid/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>${foo}</groupId>
diff --git a/its/core-it-suite/src/test/resources/mng-8244-phase-all/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8244-phase-all/pom.xml
index 35250bb229..dc58b90314 100644
--- a/its/core-it-suite/src/test/resources/mng-8244-phase-all/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8244-phase-all/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
 
   <groupId>org.apache.maven.its</groupId>
   <artifactId>mng-8244</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8245-before-after-phase-all/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8245-before-after-phase-all/pom.xml
index 910de385d0..a86b30b1c6 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8245-before-after-phase-all/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8245-before-after-phase-all/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
 
   <groupId>org.apahce.maven.its</groupId>
   <artifactId>mng-8245</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/child/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/child/pom.xml
index f7dc05cb23..4691e1983e 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <groupId>org.apache.maven.its.mng8294</groupId>
     <artifactId>bad-parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/pom.xml
index 754d2e57a3..d421f0ab28 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-mismatch/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng8294</groupId>
   <artifactId>parent</artifactId>
   <version>0.1-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-non-resolvable/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-non-resolvable/pom.xml
index 2422200ede..847b357169 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-non-resolvable/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-non-resolvable/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <parent>
     <groupId>org.apache.maven.its.mng8294</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-wrong-path/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-wrong-path/pom.xml
index 0917a0eb44..3077631764 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-wrong-path/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/bad-wrong-path/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <parent>
     <relativePath>../foo</relativePath>
   </parent>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/child/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/child/pom.xml
index 6cc57c22ab..e4a964bfe6 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent />
   <artifactId>myArtifact</artifactId>
 </project>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/pom.xml
index 754d2e57a3..d421f0ab28 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-empty/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng8294</groupId>
   <artifactId>parent</artifactId>
   <version>0.1-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/child/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/child/pom.xml
index bdd71eb2f3..c4b4c6a3be 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <groupId>org.apache.maven.its.mng8294</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/pom.xml
index 754d2e57a3..d421f0ab28 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-gav/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng8294</groupId>
   <artifactId>parent</artifactId>
   <version>0.1-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/child/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/child/pom.xml
index 4106bae8b4..7dc4b7773f 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/child/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/child/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent>
     <relativePath>..</relativePath>
   </parent>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/pom.xml
index 754d2e57a3..d421f0ab28 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8294-parent-checks/ok-using-path/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng8294</groupId>
   <artifactId>parent</artifactId>
   <version>0.1-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-a/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-a/pom.xml
index 1fe9c4fd41..38f392f316 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-a/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-a/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
   <parent>
     <groupId>org.apache.maven.its</groupId>
     <artifactId>mng8331</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-b/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-b/pom.xml
index 8597b95361..fb7d13fc8a 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-b/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/module-b/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
   <parent>
     <groupId>org.apache.maven.its</groupId>
     <artifactId>mng8331</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/pom.xml
index 334128747f..f27d4acad5 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8331-versioned-and-unversioned-deps/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
   <groupId>org.apache.maven.its</groupId>
   <artifactId>mng8331</artifactId>
   <version>1-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8341-deadlock/child1/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8341-deadlock/child1/pom.xml
index ec6599c2ec..930d636d8a 100644
--- a/its/core-it-suite/src/test/resources/mng-8341-deadlock/child1/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8341-deadlock/child1/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
   <parent>
     <groupId>org.apache.maven.its.mng8341</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8341-deadlock/child2/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8341-deadlock/child2/pom.xml
index e2faba1ff9..190f45ce91 100644
--- a/its/core-it-suite/src/test/resources/mng-8341-deadlock/child2/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8341-deadlock/child2/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
   <parent>
     <groupId>org.apache.maven.its.mng8341</groupId>
     <artifactId>parent</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8341-deadlock/parent/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8341-deadlock/parent/pom.xml
index a656236012..696e62e593 100644
--- a/its/core-it-suite/src/test/resources/mng-8341-deadlock/parent/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8341-deadlock/parent/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
diff --git a/its/core-it-suite/src/test/resources/mng-8341-deadlock/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8341-deadlock/pom.xml
index 28a7b94a41..e49a88a38b 100644
--- a/its/core-it-suite/src/test/resources/mng-8341-deadlock/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8341-deadlock/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0-beta-4.xsd";>
   <parent>
     <groupId>org.apache.maven.its.mng8341</groupId>
     <artifactId>parent</artifactId>
diff --git a/its/core-it-suite/src/test/resources/mng-8360/module1/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8360/module1/pom.xml
index 62ab3c3c22..e319bcec61 100644
--- a/its/core-it-suite/src/test/resources/mng-8360/module1/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8360/module1/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <parent />
   <artifactId>module1</artifactId>
   <packaging>pom</packaging>
diff --git a/its/core-it-suite/src/test/resources/mng-8360/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8360/pom.xml
index 29b733291d..c3816da3f8 100644
--- a/its/core-it-suite/src/test/resources/mng-8360/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8360/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>com.github.mattnelson</groupId>
   <artifactId>profiles</artifactId>
   <version>1.0.0-SNAPSHOT</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8383-unknown-type-dependencies/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8383-unknown-type-dependencies/pom.xml
index 568ce855c7..dd978c64d6 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8383-unknown-type-dependencies/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8383-unknown-type-dependencies/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
 
   <groupId>org.apache.maven.its.mng8383</groupId>
   <artifactId>root</artifactId>
diff --git a/its/core-it-suite/src/test/resources/mng-8385/spi-consumer/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8385/spi-consumer/pom.xml
index 0ef562eb2c..432afd91ad 100644
--- a/its/core-it-suite/src/test/resources/mng-8385/spi-consumer/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8385/spi-consumer/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
 
   <groupId>org.apache.maven.its.mng8385</groupId>
   <artifactId>spi-consumer</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8385/spi-extension/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8385/spi-extension/pom.xml
index c31f9165c9..8147136dea 100644
--- a/its/core-it-suite/src/test/resources/mng-8385/spi-extension/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8385/spi-extension/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
 
   <groupId>org.apache.maven.its.mng8385</groupId>
   <artifactId>spi-extension</artifactId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom-preserving.xml
 
b/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom-preserving.xml
index d4d28e6429..dee308a8e3 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom-preserving.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom-preserving.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
-         xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";
          root="true" preserve.model.version="true">
 
   <groupId>org.apache.maven.its</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom.xml
index 54dd2c4894..762213687f 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8414-consumer-pom-with-new-features/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
 
   <groupId>org.apache.maven.its</groupId>
   <artifactId>mng-8414</artifactId>
diff --git a/its/core-it-suite/src/test/resources/mng-8465/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8465/pom.xml
index d8e808d478..10864d2028 100644
--- a/its/core-it-suite/src/test/resources/mng-8465/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8465/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng8465</groupId>
   <artifactId>test</artifactId>
   <version>1.0</version>
diff --git a/its/core-it-suite/src/test/resources/mng-8469/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8469/pom.xml
index 07de5d7f6e..cee261ed80 100644
--- a/its/core-it-suite/src/test/resources/mng-8469/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8469/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <groupId>org.apache.maven.its.mng8469</groupId>
   <artifactId>test</artifactId>
   <version>1.0</version>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/pom.xml
index bbc21f6c92..d2b89d7361 100644
--- a/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng8525</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/src/it/hello-maven-plugin/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/src/it/hello-maven-plugin/pom.xml
index beb9791f69..c6265e486f 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/src/it/hello-maven-plugin/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8525-maven-di-plugin/src/it/hello-maven-plugin/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>org.apache.maven.plugins.mvn4.its</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/extension/pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/extension/pom.xml
index e952f05ba4..982914ea7e 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/extension/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/extension/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng8572</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/dummy-artifact-pom.xml
 
b/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/dummy-artifact-pom.xml
index 4bd7ecdad4..802059790d 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/dummy-artifact-pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/dummy-artifact-pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0";>
+<project xmlns="http://maven.apache.org/POM/4.0.0";>
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng8572</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/pom.xml
index 315ef25e18..12f7617253 100644
--- a/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8572-di-type-handler/test/pom.xml
@@ -17,7 +17,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <modelVersion>4.1.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng8572</groupId>
diff --git 
a/its/core-it-suite/src/test/resources/mng-8645-consumer-pom-dep-mgmt/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8645-consumer-pom-dep-mgmt/pom.xml
index 6665c0f712..0389838cae 100644
--- 
a/its/core-it-suite/src/test/resources/mng-8645-consumer-pom-dep-mgmt/pom.xml
+++ 
b/its/core-it-suite/src/test/resources/mng-8645-consumer-pom-dep-mgmt/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
+<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; root="true" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
https://maven.apache.org/xsd/maven-4.1.0.xsd";>
   <groupId>org.apache.maven.its.mng8645</groupId>
   <artifactId>test</artifactId>
   <version>1.0</version>
diff --git a/its/core-it-suite/src/test/resources/mng-8653/child-1/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8653/child-1/pom.xml
index 95b14b9006..abcd87d7f6 100644
--- a/its/core-it-suite/src/test/resources/mng-8653/child-1/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8653/child-1/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <parent />
   <artifactId>child-1</artifactId>
   <packaging>pom</packaging>
diff --git a/its/core-it-suite/src/test/resources/mng-8653/child-2/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8653/child-2/pom.xml
index a37c0aab56..3ab3e7611a 100644
--- a/its/core-it-suite/src/test/resources/mng-8653/child-2/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8653/child-2/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
   <parent />
   <artifactId>child-2</artifactId>
   <packaging>pom</packaging>
diff --git a/its/core-it-suite/src/test/resources/mng-8653/pom.xml 
b/its/core-it-suite/src/test/resources/mng-8653/pom.xml
index 26d0cd54a2..43759b6b90 100644
--- a/its/core-it-suite/src/test/resources/mng-8653/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-8653/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.1.0"; root="true">
+<project xmlns="http://maven.apache.org/POM/4.0.0"; root="true">
 
   <groupId>org.apache.maven.it.mng8653</groupId>
   <artifactId>parent</artifactId>

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