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diff --git a/src/stlplus/persistence/persistent_xref.hpp b/src/stlplus/persistence/persistent_xref.hpp
deleted file mode 100644
index c41e28d..0000000
--- a/src/stlplus/persistence/persistent_xref.hpp
+++ /dev/null
@@ -1,48 +0,0 @@
-#ifndef STLPLUS_PERSISTENT_XREF
-#define STLPLUS_PERSISTENT_XREF
-////////////////////////////////////////////////////////////////////////////////
-
-//   Author:    Andy Rushton
-//   Copyright: (c) Southampton University 1999-2004
-//              (c) Andy Rushton           2004-2009
-//   License:   BSD License, see ../docs/license.html
-
-//   Persistence for cross-references to persistent objects
-
-//   A cross-reference is a pointer to an object that has definitely been dumped
-//   already by one of dump_pointer, dump_interface or dump_callback, i.e. by
-//   one of the dump routines for pointers to objects.
-
-//   These are typically used in data structures as back-pointers or pointers
-//   between nodes.
-
-//   For example, you may have a tree with cross links. Dump the tree as the
-//   primary data structure first, then dump the cross links as cross-references
-//   afterwards. The whole tree must be dumped before any cross-references to
-//   ensure that all cross-references are known to the persistence system.
-
-//   These functions will throw an exception if the cross-reference points to
-//   something not dumped before.
-
-////////////////////////////////////////////////////////////////////////////////
-#include "persistence_fixes.hpp"
-#include "persistent_contexts.hpp"
-
-////////////////////////////////////////////////////////////////////////////////
-
-namespace stlplus
-{
-
-  template<typename T>
-  void dump_xref(dump_context&, const T* const data)
-    throw(persistent_dump_failed);
-
-  template<typename T>
-  void restore_xref(restore_context&, T*& data)
-    throw(persistent_restore_failed);
-
-} // end namespace stlplus
-
-  ////////////////////////////////////////////////////////////////////////////////
-#include "persistent_xref.tpp"
-#endif