gnodet commented on code in PR #2170:
URL: https://github.com/apache/maven/pull/2170#discussion_r2007862028


##########
impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultModelXmlFactory.java:
##########
@@ -48,8 +48,37 @@
 @Singleton
 public class DefaultModelXmlFactory implements ModelXmlFactory {
     @Override
+    @Nonnull
     public Model read(@Nonnull XmlReaderRequest request) throws 
XmlReaderException {
         nonNull(request, "request");
+        Model model = doRead(request);
+        if (isModelVersionGreaterThan400(model)
+                && 
!model.getNamespaceUri().startsWith("http://maven.apache.org/POM/";)) {
+            throw new XmlReaderException(
+                    "Invalid namespace '" + model.getNamespaceUri() + "' for 
model version " + model.getModelVersion(),
+                    null,
+                    null);
+        }
+        return model;
+    }
+
+    private boolean isModelVersionGreaterThan400(Model model) {
+        String version = model.getModelVersion();
+        if (version == null) {
+            return false;
+        }
+        try {

Review Comment:
   That's not the point. The point is that the reader needs to support existing 
models which have no namespace, and that cannot be enforced because they are in 
Maven Central.  So we can only enforce for model > 4.0.0.



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