elharo commented on code in PR #2170:
URL: https://github.com/apache/maven/pull/2170#discussion_r2008763401


##########
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/";)) {

Review Comment:
   Here you can just check the namespace for full equality rather than using 
startsWith to check only the prefix.



##########
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:
   My mistake. I was confusing model version with the namespace URI



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