Hello!
I didn't get if the cl-prevalence project is still alive but maybe someone will need this patch:
--- serialization.lisp.orig 2009-08-28 21:04:00.624489057 +0400 +++ serialization.lisp 2009-08-28 21:16:44.758777912 +0400 @@ -475,6 +475,7 @@ (write-string " . " stream) (serialize-sexp-internal (slot-value object slot) stream serialization-state) - (write-string ")" stream)))) - (write-string " ) )" stream))))) + (write-string ")" stream))) + (princ " )" stream)) + (write-string " )" stream)))))
;;; Deserialize CLOS instances and Lisp primitives from the XML representation