use full namespace qualification to try to fix test failure with xml archives

on darwin 4.4 with intel 1.1 compiler

[SVN r65333]

libs/serialization

@@ -1 +1 @@
-Subproject commit c0bde7203a980889030d4175bccc79a51ff4a516
+Subproject commit 51f672f8dfd10badbe50c2c4a4b8ebc41a54071c