diff --git a/maven-compat/src/test/resources/pom.xml b/maven-compat/src/test/resources/pom.xml
index 9443d87de35..55dda42afb8 100644
--- a/maven-compat/src/test/resources/pom.xml
+++ b/maven-compat/src/test/resources/pom.xml
@@ -37,7 +37,7 @@ under the License.
 -->
 
 <model 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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven</groupId>
   <artifactId>maven-core</artifactId>
diff --git a/maven-core/src/test/projects/lifecycle-executor/mojo-configuration/pom.xml b/maven-core/src/test/projects/lifecycle-executor/mojo-configuration/pom.xml
index a821765bc5f..15f7c31441b 100644
--- a/maven-core/src/test/projects/lifecycle-executor/mojo-configuration/pom.xml
+++ b/maven-core/src/test/projects/lifecycle-executor/mojo-configuration/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.lifecycle.test</groupId>
   <artifactId>mojo-configuration</artifactId>
diff --git a/maven-core/src/test/projects/lifecycle-executor/project-with-additional-lifecycle-elements/pom.xml b/maven-core/src/test/projects/lifecycle-executor/project-with-additional-lifecycle-elements/pom.xml
index 83080888d3c..803c59cee25 100644
--- a/maven-core/src/test/projects/lifecycle-executor/project-with-additional-lifecycle-elements/pom.xml
+++ b/maven-core/src/test/projects/lifecycle-executor/project-with-additional-lifecycle-elements/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.lifecycle.test</groupId>
   <artifactId>project-with-additional-lifecycle-elements</artifactId>
diff --git a/maven-core/src/test/projects/project-builder/MNG-6716/project/pom.xml b/maven-core/src/test/projects/project-builder/MNG-6716/project/pom.xml
index 9ffa86503e7..4a27bacd15a 100644
--- a/maven-core/src/test/projects/project-builder/MNG-6716/project/pom.xml
+++ b/maven-core/src/test/projects/project-builder/MNG-6716/project/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.tests</groupId>
   <artifactId>MNG-6716</artifactId>
diff --git a/maven-core/src/test/remote-repo/org/apache/apache/1/apache-1.pom b/maven-core/src/test/remote-repo/org/apache/apache/1/apache-1.pom
index ad6b8543807..88d8db4aa05 100644
--- a/maven-core/src/test/remote-repo/org/apache/apache/1/apache-1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/apache/1/apache-1.pom
@@ -17,7 +17,7 @@
   -->
 
 <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/maven-v4_0_0.xsd">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <!-- Shared parent. Doesn't define a lot of things about Apache like general mailing lists, but does
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/maven-it-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/maven-it-plugin-0.1.pom
index 4cd0ff00547..59435c4dc2c 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/maven-it-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/maven-it-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/pom.xml b/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/pom.xml
index 4cd0ff00547..59435c4dc2c 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/pom.xml
+++ b/maven-core/src/test/remote-repo/org/apache/maven/its/plugins/maven-it-plugin/0.1/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-clean-plugin/0.1/maven-clean-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-clean-plugin/0.1/maven-clean-plugin-0.1.pom
index e4318d0764b..9159aab1eee 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-clean-plugin/0.1/maven-clean-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-clean-plugin/0.1/maven-clean-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-compiler-plugin/0.1/maven-compiler-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-compiler-plugin/0.1/maven-compiler-plugin-0.1.pom
index 22371630ecd..18191d7ff83 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-compiler-plugin/0.1/maven-compiler-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-compiler-plugin/0.1/maven-compiler-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-deploy-plugin/0.1/maven-deploy-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-deploy-plugin/0.1/maven-deploy-plugin-0.1.pom
index 82ed5748594..a791fe67701 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-deploy-plugin/0.1/maven-deploy-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-deploy-plugin/0.1/maven-deploy-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-install-plugin/0.1/maven-install-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-install-plugin/0.1/maven-install-plugin-0.1.pom
index 1ce2bd06e19..bc943aac15a 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-install-plugin/0.1/maven-install-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-install-plugin/0.1/maven-install-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-jar-plugin/0.1/maven-jar-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-jar-plugin/0.1/maven-jar-plugin-0.1.pom
index d8abdf6fe3c..7b6cde451e5 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-jar-plugin/0.1/maven-jar-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-jar-plugin/0.1/maven-jar-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-plugin-plugin/0.1/maven-plugin-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-plugin-plugin/0.1/maven-plugin-plugin-0.1.pom
index 7df6bdbc462..fdde1f1cf4f 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-plugin-plugin/0.1/maven-plugin-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-plugin-plugin/0.1/maven-plugin-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-resources-plugin/0.1/maven-resources-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-resources-plugin/0.1/maven-resources-plugin-0.1.pom
index 782dbf7d22b..6670ee21caf 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-resources-plugin/0.1/maven-resources-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-resources-plugin/0.1/maven-resources-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-surefire-plugin/0.1/maven-surefire-plugin-0.1.pom b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-surefire-plugin/0.1/maven-surefire-plugin-0.1.pom
index 3588a0433fe..89524711c8f 100644
--- a/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-surefire-plugin/0.1/maven-surefire-plugin-0.1.pom
+++ b/maven-core/src/test/remote-repo/org/apache/maven/plugins/maven-surefire-plugin/0.1/maven-surefire-plugin-0.1.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.plugins</groupId>
diff --git a/maven-core/src/test/resources-project-builder/dependency-inheritance/maven-parent.xml b/maven-core/src/test/resources-project-builder/dependency-inheritance/maven-parent.xml
index 6d642626c3b..0d93ad2fe3d 100644
--- a/maven-core/src/test/resources-project-builder/dependency-inheritance/maven-parent.xml
+++ b/maven-core/src/test/resources-project-builder/dependency-inheritance/maven-parent.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven</groupId>
diff --git a/maven-core/src/test/resources-project-builder/dependency-order/w-plugin-mgmt/pom.xml b/maven-core/src/test/resources-project-builder/dependency-order/w-plugin-mgmt/pom.xml
index 5882ab5c9ef..23dfedebb72 100644
--- a/maven-core/src/test/resources-project-builder/dependency-order/w-plugin-mgmt/pom.xml
+++ b/maven-core/src/test/resources-project-builder/dependency-order/w-plugin-mgmt/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng4003</groupId>
diff --git a/maven-core/src/test/resources-project-builder/dependency-order/wo-plugin-mgmt/pom.xml b/maven-core/src/test/resources-project-builder/dependency-order/wo-plugin-mgmt/pom.xml
index 57bd6d0fbba..c8538734282 100644
--- a/maven-core/src/test/resources-project-builder/dependency-order/wo-plugin-mgmt/pom.xml
+++ b/maven-core/src/test/resources-project-builder/dependency-order/wo-plugin-mgmt/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng4003</groupId>
diff --git a/maven-core/src/test/resources-project-builder/dual-execution-ids/pom.xml b/maven-core/src/test/resources-project-builder/dual-execution-ids/pom.xml
index 8833c089666..75a05154f96 100644
--- a/maven-core/src/test/resources-project-builder/dual-execution-ids/pom.xml
+++ b/maven-core/src/test/resources-project-builder/dual-execution-ids/pom.xml
@@ -1,5 +1,5 @@
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.mercury</groupId>
   <artifactId>mercury-parent</artifactId>
diff --git a/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/nexus-parent.xml b/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/nexus-parent.xml
index d2ac100c62f..daa31de3785 100644
--- a/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/nexus-parent.xml
+++ b/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/nexus-parent.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.sonatype.nexus</groupId>
diff --git a/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/pom.xml b/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/pom.xml
index b12db4f084b..f465d91e722 100644
--- a/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/pom.xml
+++ b/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<parent>
diff --git a/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/sub/pom.xml b/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/sub/pom.xml
index 37b166d197f..a48cbad8028 100644
--- a/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/sub/pom.xml
+++ b/maven-core/src/test/resources-project-builder/duplicate-exclusions-dependency/sub/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <parent>
     <groupId>org.sonatype.nexus</groupId>
     <artifactId>nexus</artifactId>
diff --git a/maven-core/src/test/resources-project-builder/equal-plugin-deps/pom.xml b/maven-core/src/test/resources-project-builder/equal-plugin-deps/pom.xml
index d33b2bae6fa..bfc1c804f2d 100644
--- a/maven-core/src/test/resources-project-builder/equal-plugin-deps/pom.xml
+++ b/maven-core/src/test/resources-project-builder/equal-plugin-deps/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng3838</groupId>
diff --git a/maven-core/src/test/resources-project-builder/execution-configuration-subcollections/pom.xml b/maven-core/src/test/resources-project-builder/execution-configuration-subcollections/pom.xml
index e5b19d4ebdb..1b2b3708943 100644
--- a/maven-core/src/test/resources-project-builder/execution-configuration-subcollections/pom.xml
+++ b/maven-core/src/test/resources-project-builder/execution-configuration-subcollections/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>test</groupId>
     <artifactId>nexus</artifactId>
diff --git a/maven-core/src/test/resources-project-builder/foo/sub/pom.xml b/maven-core/src/test/resources-project-builder/foo/sub/pom.xml
index dc10bd1cdbc..4217dcfc5a0 100644
--- a/maven-core/src/test/resources-project-builder/foo/sub/pom.xml
+++ b/maven-core/src/test/resources-project-builder/foo/sub/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
 
   <modelVersion>4.0.0</modelVersion>
  <!--
diff --git a/maven-core/src/test/resources-project-builder/merged-filter-order/pom.xml b/maven-core/src/test/resources-project-builder/merged-filter-order/pom.xml
index 6f4df9acd82..32ac97eb7df 100644
--- a/maven-core/src/test/resources-project-builder/merged-filter-order/pom.xml
+++ b/maven-core/src/test/resources-project-builder/merged-filter-order/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng4008</groupId>
diff --git a/maven-core/src/test/resources-project-builder/merged-filter-order/sub/pom.xml b/maven-core/src/test/resources-project-builder/merged-filter-order/sub/pom.xml
index 7e7155bf205..340b3fc9144 100644
--- a/maven-core/src/test/resources-project-builder/merged-filter-order/sub/pom.xml
+++ b/maven-core/src/test/resources-project-builder/merged-filter-order/sub/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <parent>
diff --git a/maven-core/src/test/resources-project-builder/micromailer/pom.xml b/maven-core/src/test/resources-project-builder/micromailer/pom.xml
index 780faac2356..a1329545bb0 100644
--- a/maven-core/src/test/resources-project-builder/micromailer/pom.xml
+++ b/maven-core/src/test/resources-project-builder/micromailer/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
 
diff --git a/maven-core/src/test/resources-project-builder/micromailer/spice-parent-9.pom b/maven-core/src/test/resources-project-builder/micromailer/spice-parent-9.pom
index 695c3c93c01..8a81b7fdbbc 100644
--- a/maven-core/src/test/resources-project-builder/micromailer/spice-parent-9.pom
+++ b/maven-core/src/test/resources-project-builder/micromailer/spice-parent-9.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.sonatype.spice</groupId>
 	<artifactId>spice-parent</artifactId>
diff --git a/maven-core/src/test/resources-project-builder/multiple-filters/pom.xml b/maven-core/src/test/resources-project-builder/multiple-filters/pom.xml
index 1141efb5a70..e257cbe1e90 100644
--- a/maven-core/src/test/resources-project-builder/multiple-filters/pom.xml
+++ b/maven-core/src/test/resources-project-builder/multiple-filters/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
 
   <modelVersion>4.0.0</modelVersion>
   <groupId>a</groupId>
diff --git a/maven-core/src/test/resources-project-builder/platform-file-separator/pom.xml b/maven-core/src/test/resources-project-builder/platform-file-separator/pom.xml
index 26ba2943650..41f35c148b9 100644
--- a/maven-core/src/test/resources-project-builder/platform-file-separator/pom.xml
+++ b/maven-core/src/test/resources-project-builder/platform-file-separator/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng3877</groupId>
diff --git a/maven-core/src/test/resources-project-builder/plugin-config-properties/pom.xml b/maven-core/src/test/resources-project-builder/plugin-config-properties/pom.xml
index e56603919bb..5701067bb4c 100644
--- a/maven-core/src/test/resources-project-builder/plugin-config-properties/pom.xml
+++ b/maven-core/src/test/resources-project-builder/plugin-config-properties/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>a</groupId>
diff --git a/maven-core/src/test/resources-project-builder/profile-default-deactivation/pom.xml b/maven-core/src/test/resources-project-builder/profile-default-deactivation/pom.xml
index dfe19253f8a..2055d66371d 100644
--- a/maven-core/src/test/resources-project-builder/profile-default-deactivation/pom.xml
+++ b/maven-core/src/test/resources-project-builder/profile-default-deactivation/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.its.mng3545</groupId>
   <artifactId>test-artifact</artifactId>
diff --git a/maven-core/src/test/resources-project-builder/reporting-plugin-config/pom.xml b/maven-core/src/test/resources-project-builder/reporting-plugin-config/pom.xml
index fdb455a0909..bb98c079b64 100644
--- a/maven-core/src/test/resources-project-builder/reporting-plugin-config/pom.xml
+++ b/maven-core/src/test/resources-project-builder/reporting-plugin-config/pom.xml
@@ -17,7 +17,7 @@
   -->
 
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng3811</groupId>
diff --git a/maven-core/src/test/resources-project-builder/reporting-plugin-config/sub/pom.xml b/maven-core/src/test/resources-project-builder/reporting-plugin-config/sub/pom.xml
index b0768271f53..cdc8fb1f2f8 100644
--- a/maven-core/src/test/resources-project-builder/reporting-plugin-config/sub/pom.xml
+++ b/maven-core/src/test/resources-project-builder/reporting-plugin-config/sub/pom.xml
@@ -17,7 +17,7 @@
   -->
 
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
 <parent>
diff --git a/maven-core/src/test/resources-project-builder/single-configuration-inheritance/jetty-parent.xml b/maven-core/src/test/resources-project-builder/single-configuration-inheritance/jetty-parent.xml
index 40031e363e8..fad518f17b4 100644
--- a/maven-core/src/test/resources-project-builder/single-configuration-inheritance/jetty-parent.xml
+++ b/maven-core/src/test/resources-project-builder/single-configuration-inheritance/jetty-parent.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.mortbay.jetty</groupId>
   <artifactId>jetty-parent</artifactId>
diff --git a/maven-core/src/test/resources-project-builder/single-configuration-inheritance/pom.xml b/maven-core/src/test/resources-project-builder/single-configuration-inheritance/pom.xml
index 695ffaff0cf..1e7478bdcc0 100644
--- a/maven-core/src/test/resources-project-builder/single-configuration-inheritance/pom.xml
+++ b/maven-core/src/test/resources-project-builder/single-configuration-inheritance/pom.xml
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.mortbay.jetty</groupId>
diff --git a/maven-core/src/test/resources-project-builder/unc-path/pom.xml b/maven-core/src/test/resources-project-builder/unc-path/pom.xml
index be2a825ad76..b2b9775527f 100644
--- a/maven-core/src/test/resources-project-builder/unc-path/pom.xml
+++ b/maven-core/src/test/resources-project-builder/unc-path/pom.xml
@@ -17,7 +17,7 @@
   -->
 
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng3621</groupId>
diff --git a/maven-core/src/test/resources-project-builder/unc-path/sub/pom.xml b/maven-core/src/test/resources-project-builder/unc-path/sub/pom.xml
index fddd8723bd4..5bb4bbb4458 100644
--- a/maven-core/src/test/resources-project-builder/unc-path/sub/pom.xml
+++ b/maven-core/src/test/resources-project-builder/unc-path/sub/pom.xml
@@ -17,7 +17,7 @@
   -->
 
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
 <parent>
diff --git a/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/child/pom.xml b/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/child/pom.xml
index 9304f5d0c25..cdc7b75aabe 100644
--- a/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/child/pom.xml
+++ b/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/child/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <parent>
diff --git a/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/pom.xml b/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/pom.xml
index 768a5e98300..88d372c96bf 100644
--- a/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/pom.xml
+++ b/maven-core/src/test/resources-project-builder/unprefixed-expression-interpolation/pom.xml
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.apache.maven.its.mng3831</groupId>
diff --git a/maven-core/src/test/resources-settings/settings-no-pom/pom.xml b/maven-core/src/test/resources-settings/settings-no-pom/pom.xml
index ee627826196..3632d845e10 100644
--- a/maven-core/src/test/resources-settings/settings-no-pom/pom.xml
+++ b/maven-core/src/test/resources-settings/settings-no-pom/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<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/maven-v4_0_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-4.0.0.xsd">
 	
 	<modelVersion>4.0.0</modelVersion>
 	
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/junit/junit/3.8.1/junit-3.8.1.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/junit/junit/3.8.1/junit-3.8.1.pom
index 2169a65d766..1526693d25c 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/junit/junit/3.8.1/junit-3.8.1.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/junit/junit/3.8.1/junit-3.8.1.pom
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <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/maven-v4_0_0.xsd ">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd ">
   <modelVersion>4.0.0</modelVersion>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/apache/3/apache-3.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/apache/3/apache-3.pom
index 1fc7e406016..9593e9e74de 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/apache/3/apache-3.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/apache/3/apache-3.pom
@@ -17,7 +17,7 @@
   -->
 
 <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/maven-v4_0_0.xsd">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <!-- Shared parent. Doesn't define a lot of things about Apache like general mailing lists, but does
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/artifact/maven-artifact/3.0-SNAPSHOT/maven-artifact-3.0-SNAPSHOT.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/artifact/maven-artifact/3.0-SNAPSHOT/maven-artifact-3.0-SNAPSHOT.pom
index 8de3ce6d02c..9ebbbb43735 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/artifact/maven-artifact/3.0-SNAPSHOT/maven-artifact-3.0-SNAPSHOT.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/artifact/maven-artifact/3.0-SNAPSHOT/maven-artifact-3.0-SNAPSHOT.pom
@@ -20,7 +20,7 @@ under the License.
 -->
 
 <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/maven-v4_0_0.xsd">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <parent>
     <artifactId>maven-parent</artifactId>
     <groupId>org.apache.maven</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-extension/1/test-extension-1.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-extension/1/test-extension-1.pom
index 70114e72b60..784b3159975 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-extension/1/test-extension-1.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-extension/1/test-extension-1.pom
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.core.test</groupId>
   <artifactId>test-extension</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-lifecycle-and-artifactHandler/1/test-lifecycle-and-artifactHandler-1.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-lifecycle-and-artifactHandler/1/test-lifecycle-and-artifactHandler-1.pom
index d9e4cde9a18..535b3be9682 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-lifecycle-and-artifactHandler/1/test-lifecycle-and-artifactHandler-1.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/core/test/test-lifecycle-and-artifactHandler/1/test-lifecycle-and-artifactHandler-1.pom
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.core.test</groupId>
   <artifactId>test-lifecycle-and-artifactHandler</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/4/maven-parent-4.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/4/maven-parent-4.pom
index 132d9d73654..b41037fc738 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/4/maven-parent-4.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/4/maven-parent-4.pom
@@ -16,7 +16,7 @@
   ~ limitations under the License.
   -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.apache</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/5/maven-parent-5.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/5/maven-parent-5.pom
index e6100b45d4d..9718a64655f 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/5/maven-parent-5.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/maven-parent/5/maven-parent-5.pom
@@ -19,7 +19,7 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.apache</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/wagon/wagon/1.0-beta-2/wagon-1.0-beta-2.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/wagon/wagon/1.0-beta-2/wagon-1.0-beta-2.pom
index 27faa8efa7d..9cb2f6eec57 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/wagon/wagon/1.0-beta-2/wagon-1.0-beta-2.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/apache/maven/wagon/wagon/1.0-beta-2/wagon-1.0-beta-2.pom
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <artifactId>maven-parent</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-active-collections/1.0-beta-1/plexus-active-collections-1.0-beta-1.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-active-collections/1.0-beta-1/plexus-active-collections-1.0-beta-1.pom
index 80ac6d9059a..f43329c027a 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-active-collections/1.0-beta-1/plexus-active-collections-1.0-beta-1.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-active-collections/1.0-beta-1/plexus-active-collections-1.0-beta-1.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <artifactId>plexus-components</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-classworlds/1.2-alpha-10/plexus-classworlds-1.2-alpha-10.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-classworlds/1.2-alpha-10/plexus-classworlds-1.2-alpha-10.pom
index be71f49f618..be34b8ca297 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-classworlds/1.2-alpha-10/plexus-classworlds-1.2-alpha-10.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-classworlds/1.2-alpha-10/plexus-classworlds-1.2-alpha-10.pom
@@ -15,7 +15,7 @@
   ~  limitations under the License.
   -->
 
-<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/maven-v4_0_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-4.0.0.xsd">
   <parent>
     <artifactId>plexus</artifactId>
     <groupId>org.codehaus.plexus</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-component-api/1.0-alpha-32/plexus-component-api-1.0-alpha-32.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-component-api/1.0-alpha-32/plexus-component-api-1.0-alpha-32.pom
index 6369d8ec52d..f6ff7ea0568 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-component-api/1.0-alpha-32/plexus-component-api-1.0-alpha-32.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-component-api/1.0-alpha-32/plexus-component-api-1.0-alpha-32.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.codehaus.plexus</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-container-default/1.0-alpha-32/plexus-container-default-1.0-alpha-32.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-container-default/1.0-alpha-32/plexus-container-default-1.0-alpha-32.pom
index fbfdb2bac77..2904ba91eba 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-container-default/1.0-alpha-32/plexus-container-default-1.0-alpha-32.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-container-default/1.0-alpha-32/plexus-container-default-1.0-alpha-32.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.codehaus.plexus</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-16/plexus-containers-1.0-alpha-16.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-16/plexus-containers-1.0-alpha-16.pom
index 5800d75beb7..e6a8a43eea1 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-16/plexus-containers-1.0-alpha-16.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-16/plexus-containers-1.0-alpha-16.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.codehaus.plexus</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-32/plexus-containers-1.0-alpha-32.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-32/plexus-containers-1.0-alpha-32.pom
index 4678bd8767a..e5b3ee8414c 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-32/plexus-containers-1.0-alpha-32.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-containers/1.0-alpha-32/plexus-containers-1.0-alpha-32.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.codehaus.plexus</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-utils/1.4.5/plexus-utils-1.4.5.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-utils/1.4.5/plexus-utils-1.4.5.pom
index bc634a6f196..55baddfd90f 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-utils/1.4.5/plexus-utils-1.4.5.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus-utils/1.4.5/plexus-utils-1.4.5.pom
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?><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/maven-v4_0_0.xsd">
+<?xml version="1.0" encoding="UTF-8"?><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-4.0.0.xsd">
   <parent>
     <artifactId>plexus</artifactId>
     <groupId>org.codehaus.plexus</groupId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.10/plexus-1.0.10.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.10/plexus-1.0.10.pom
index bc94e24bd71..a2177bd2695 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.10/plexus-1.0.10.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.10/plexus-1.0.10.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.codehaus.plexus</groupId>
   <artifactId>plexus</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.11/plexus-1.0.11.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.11/plexus-1.0.11.pom
index 28ee5744c72..5145f228b69 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.11/plexus-1.0.11.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.11/plexus-1.0.11.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.codehaus.plexus</groupId>
   <artifactId>plexus</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.8/plexus-1.0.8.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.8/plexus-1.0.8.pom
index cba2014f962..afb044ec1cc 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.8/plexus-1.0.8.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.8/plexus-1.0.8.pom
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.codehaus.plexus</groupId>
   <artifactId>plexus</artifactId>
diff --git a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.9/plexus-1.0.9.pom b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.9/plexus-1.0.9.pom
index f6fca7c823d..9926958e457 100644
--- a/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.9/plexus-1.0.9.pom
+++ b/maven-core/src/test/resources/org/apache/maven/extension/test-extension-repo/org/codehaus/plexus/plexus/1.0.9/plexus-1.0.9.pom
@@ -1,4 +1,4 @@
-<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/maven-v4_0_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-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.codehaus.plexus</groupId>
   <artifactId>plexus</artifactId>
diff --git a/maven-core/src/test/resources/project-dynamism/plugin-level-dep.pom.xml b/maven-core/src/test/resources/project-dynamism/plugin-level-dep.pom.xml
index 988736751af..625f63eaee0 100644
--- a/maven-core/src/test/resources/project-dynamism/plugin-level-dep.pom.xml
+++ b/maven-core/src/test/resources/project-dynamism/plugin-level-dep.pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>testing</groupId>
   <artifactId>plugin-level-dep</artifactId>
diff --git a/maven-core/src/test/resources/project-dynamism/pom-interp.xml b/maven-core/src/test/resources/project-dynamism/pom-interp.xml
index 40fdb4149d9..7b600fac469 100644
--- a/maven-core/src/test/resources/project-dynamism/pom-interp.xml
+++ b/maven-core/src/test/resources/project-dynamism/pom-interp.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 
   <modelVersion>4.0.0</modelVersion>
diff --git a/maven-core/src/test/resources/project-dynamism/pom-relative.xml b/maven-core/src/test/resources/project-dynamism/pom-relative.xml
index bb22b3d0776..5231ce46b82 100644
--- a/maven-core/src/test/resources/project-dynamism/pom-relative.xml
+++ b/maven-core/src/test/resources/project-dynamism/pom-relative.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 
   <modelVersion>4.0.0</modelVersion>
diff --git a/maven-core/src/test/resources/project-dynamism/pom.xml b/maven-core/src/test/resources/project-dynamism/pom.xml
index 37797f2ee62..743c0941067 100644
--- a/maven-core/src/test/resources/project-dynamism/pom.xml
+++ b/maven-core/src/test/resources/project-dynamism/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 
   <modelVersion>4.0.0</modelVersion>
diff --git a/maven-core/src/test/resources/projects/modelsource/module01/pom.xml b/maven-core/src/test/resources/projects/modelsource/module01/pom.xml
index cfaf9e8fa40..43976662cc8 100644
--- a/maven-core/src/test/resources/projects/modelsource/module01/pom.xml
+++ b/maven-core/src/test/resources/projects/modelsource/module01/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <parent>
diff --git a/maven-core/src/test/resources/projects/modelsource/pom.xml b/maven-core/src/test/resources/projects/modelsource/pom.xml
index 0fe29370e71..a3abab93446 100644
--- a/maven-core/src/test/resources/projects/modelsource/pom.xml
+++ b/maven-core/src/test/resources/projects/modelsource/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>test.readparent</groupId>
   <artifactId>local-parent</artifactId>
diff --git a/maven-embedder/src/examples/simple-project/pom.xml b/maven-embedder/src/examples/simple-project/pom.xml
index c4ad90d22f3..62de37aac1b 100644
--- a/maven-embedder/src/examples/simple-project/pom.xml
+++ b/maven-embedder/src/examples/simple-project/pom.xml
@@ -18,7 +18,7 @@ under the License.
 -->
 
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.embedder</groupId>
   <artifactId>simple-project</artifactId>
diff --git a/maven-embedder/src/test/embedder-test-project/pom.xml b/maven-embedder/src/test/embedder-test-project/pom.xml
index aed1516129e..9917dd5ba29 100644
--- a/maven-embedder/src/test/embedder-test-project/pom.xml
+++ b/maven-embedder/src/test/embedder-test-project/pom.xml
@@ -10,7 +10,7 @@
   -->
 
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven</groupId>
   <artifactId>embedder-test-project</artifactId>
diff --git a/maven-embedder/src/test/error-reporting-projects/ext-realm-error/ext/pom.xml b/maven-embedder/src/test/error-reporting-projects/ext-realm-error/ext/pom.xml
index a567706751e..647516e66eb 100644
--- a/maven-embedder/src/test/error-reporting-projects/ext-realm-error/ext/pom.xml
+++ b/maven-embedder/src/test/error-reporting-projects/ext-realm-error/ext/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.errortest</groupId>
   <artifactId>test-maven-ext</artifactId>
diff --git a/maven-embedder/src/test/error-reporting-projects/missing-module-pom/pom.xml b/maven-embedder/src/test/error-reporting-projects/missing-module-pom/pom.xml
index ff895b80a3a..92b6debae68 100644
--- a/maven-embedder/src/test/error-reporting-projects/missing-module-pom/pom.xml
+++ b/maven-embedder/src/test/error-reporting-projects/missing-module-pom/pom.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='UTF-8'?>
-<project xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd' xmlns='http://maven.apache.org/POM/4.0.0'>
+<project 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-4.0.0.xsd' xmlns='http://maven.apache.org/POM/4.0.0'>
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.errortest</groupId>
   <artifactId>missing-module-pom</artifactId>
diff --git a/maven-embedder/src/test/error-reporting-projects/profile-activator-lookup-err/ext/pom.xml b/maven-embedder/src/test/error-reporting-projects/profile-activator-lookup-err/ext/pom.xml
index 0f93b9e66d2..c72cc0ab442 100644
--- a/maven-embedder/src/test/error-reporting-projects/profile-activator-lookup-err/ext/pom.xml
+++ b/maven-embedder/src/test/error-reporting-projects/profile-activator-lookup-err/ext/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.errortest</groupId>
   <artifactId>profile-activator-lookup-err-ext</artifactId>
diff --git a/maven-embedder/src/test/error-reporting-projects/project-mojo-failure/pom.xml b/maven-embedder/src/test/error-reporting-projects/project-mojo-failure/pom.xml
index 9323d4ea04e..3064b59795f 100644
--- a/maven-embedder/src/test/error-reporting-projects/project-mojo-failure/pom.xml
+++ b/maven-embedder/src/test/error-reporting-projects/project-mojo-failure/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven.test.error</groupId>
   <artifactId>project-mojo-failure</artifactId>
diff --git a/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/project/pom.xml b/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/project/pom.xml
index d59739755d5..d7151f24f0a 100644
--- a/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/project/pom.xml
+++ b/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/project/pom.xml
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.codehaus.m2eclipse</groupId>
diff --git a/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/repository/org/codehaus/m2eclipse/parent/1.0-SNAPSHOT/parent-1.0-SNAPSHOT.pom b/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/repository/org/codehaus/m2eclipse/parent/1.0-SNAPSHOT/parent-1.0-SNAPSHOT.pom
index 4aaf168635e..b7f47b03443 100644
--- a/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/repository/org/codehaus/m2eclipse/parent/1.0-SNAPSHOT/parent-1.0-SNAPSHOT.pom
+++ b/maven-embedder/src/test/projects/isolated-project-getting-parent-pom/repository/org/codehaus/m2eclipse/parent/1.0-SNAPSHOT/parent-1.0-SNAPSHOT.pom
@@ -1,5 +1,5 @@
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.codehaus.m2eclipse</groupId>
   <artifactId>parent</artifactId>
diff --git a/maven-embedder/src/test/projects/optional-dep/pom.xml b/maven-embedder/src/test/projects/optional-dep/pom.xml
index 56c99e13634..12e2c55ec02 100644
--- a/maven-embedder/src/test/projects/optional-dep/pom.xml
+++ b/maven-embedder/src/test/projects/optional-dep/pom.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>optionaldependency</groupId>
   <artifactId>p01</artifactId>
diff --git a/maven-embedder/src/test/resources/pom2.xml b/maven-embedder/src/test/resources/pom2.xml
index b99ad32e170..00744d9d2f5 100644
--- a/maven-embedder/src/test/resources/pom2.xml
+++ b/maven-embedder/src/test/resources/pom2.xml
@@ -18,7 +18,7 @@ under the License.
 -->
 
 <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/maven-v4_0_0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.maven</groupId>
   <artifactId>embedder-test-project2</artifactId>