Index: libs/serialization/src/basic_xml_grammar.ipp
===================================================================
--- libs/serialization/src/basic_xml_grammar.ipp	(revision 66354)
+++ libs/serialization/src/basic_xml_grammar.ipp	(working copy)
@@ -271,9 +271,9 @@
       =  -S
       >> "<boost_serialization"
       >> S
-      >> SignatureAttribute
-      >> S
-      >> VersionAttribute
+      >> ( (SignatureAttribute >> S >> VersionAttribute)
+         | (VersionAttribute >> S >> SignatureAttribute)
+         )
       >> !S
       >> '>'
     ;