Fix stax parsing xml:space attribute and fix stax writer

Author: gnodet

src/mdo/reader-stax.vm

@@ -70,6 +70,11 @@ public class ${className} {
      */
     private static final String XSI_NAMESPACE = "http://www.w3.org/2001/XMLSchema-instance";
 
+    /**
+     * XML namespace
+     */
+    private static final String XML_NAMESPACE = "http://www.w3.org/XML/1998/namespace";
+
     private static final Map<String, String> DEFAULT_ENTITIES;
     static {
         Map<String, String> entities = new HashMap<>();
@@ -521,8 +526,8 @@ public class ${className} {
             String name = parser.getAttributeLocalName(i);
             String ns = parser.getAttributeNamespace(i);
             String value = parser.getAttributeValue(i);
-            if (XSI_NAMESPACE.equals(ns)) {
-                // just ignore attributes with non-default namespace (for example: xmlns:xsi)
+            if (XSI_NAMESPACE.equals(ns) || XML_NAMESPACE.equals(ns)) {
+                // just ignore attributes with non-default namespace (for example: xsi and xml)
   #if ( $class == $root )
             } else if ("xmlns".equals(name)) {
                 // ignore xmlns attribute in root class, which is a reserved attribute name