gnodet commented on code in PR #11823:
URL: https://github.com/apache/maven/pull/11823#discussion_r2982267531


##########
impl/maven-xml/src/main/java/org/apache/maven/internal/xml/DefaultXmlService.java:
##########
@@ -178,6 +176,42 @@ private void writeNode(XMLStreamWriter xmlWriter, XmlNode 
node) throws XMLStream
         xmlWriter.writeEndElement();
     }
 
+    static void writeAttributes(XMLStreamWriter xmlWriter, Map<String, String> 
attributes) throws XMLStreamException {
+        // Write namespace declarations first, then regular attributes
+        for (Map.Entry<String, String> attr : attributes.entrySet()) {
+            String key = attr.getKey();
+            if ("xmlns".equals(key)) {
+                xmlWriter.writeDefaultNamespace(attr.getValue());
+            } else if (key.startsWith("xmlns:")) {
+                xmlWriter.writeNamespace(key.substring(6), attr.getValue());
+            }
+        }
+        for (Map.Entry<String, String> attr : attributes.entrySet()) {

Review Comment:
   _Claude Code on behalf of Guillaume Nodet_
   
   Fixed — renamed to `attribute`.



##########
impl/maven-xml/src/main/java/org/apache/maven/internal/xml/DefaultXmlService.java:
##########
@@ -178,6 +176,42 @@ private void writeNode(XMLStreamWriter xmlWriter, XmlNode 
node) throws XMLStream
         xmlWriter.writeEndElement();
     }
 
+    static void writeAttributes(XMLStreamWriter xmlWriter, Map<String, String> 
attributes) throws XMLStreamException {
+        // Write namespace declarations first, then regular attributes
+        for (Map.Entry<String, String> attr : attributes.entrySet()) {
+            String key = attr.getKey();
+            if ("xmlns".equals(key)) {
+                xmlWriter.writeDefaultNamespace(attr.getValue());
+            } else if (key.startsWith("xmlns:")) {
+                xmlWriter.writeNamespace(key.substring(6), attr.getValue());
+            }
+        }
+        for (Map.Entry<String, String> attr : attributes.entrySet()) {
+            String key = attr.getKey();
+            String value = attr.getValue();
+            if ("xmlns".equals(key) || key.startsWith("xmlns:")) {
+                continue; // already written above
+            } else if (key.startsWith("xml:")) {

Review Comment:
   _Claude Code on behalf of Guillaume Nodet_
   
   You're right that the `xml:` prefix is predefined and must not be declared. 
However, we can't make this branch empty — attributes like 
`xml:space="preserve"` still need to be written to the output. If we skip them, 
whitespace preservation would be lost on round-trip. The 
`writeAttribute(namespaceURI, localName, value)` call is the correct StAX way 
to write them — it writes the attribute with the proper namespace without 
declaring the prefix (since it's predefined). Added a comment to explain this.



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