omit xlmns when decode

typeinfo.go

@@ -119,8 +119,8 @@ func structFieldInfo(typ reflect.Type, f *reflect.StructField, inDecode bool) (*
 		finfo.xmlns, tag = ns, t
 	}
 	if inDecode {
-		if ns, t, ok := strings.Cut(tag, ":"); ok {
+		if _, t, ok := strings.Cut(tag, ":"); ok {
-			finfo.xmlns, tag = ns, t
+			finfo.xmlns, tag = "", t
 		}
 	}