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diff --git a/synfig-core/src/synfig/guid.h b/synfig-core/src/synfig/guid.h
new file mode 100644
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+++ b/synfig-core/src/synfig/guid.h
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+/* === S Y N F I G ========================================================= */
+/*!	\file guid.h
+**	\brief Template Header
+**
+**	$Id$
+**
+**	\legal
+**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**
+**	This package is free software; you can redistribute it and/or
+**	modify it under the terms of the GNU General Public License as
+**	published by the Free Software Foundation; either version 2 of
+**	the License, or (at your option) any later version.
+**
+**	This package is distributed in the hope that it will be useful,
+**	but WITHOUT ANY WARRANTY; without even the implied warranty of
+**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+**	General Public License for more details.
+**	\endlegal
+*/
+/* ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __SYNFIG_GUID_H
+#define __SYNFIG_GUID_H
+
+/* === H E A D E R S ======================================================= */
+
+#include "string.h"
+#include <stdint.h>
+#include <cassert>
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+namespace synfig {
+
+class GUID
+{
+	union {
+		struct {
+			unsigned int a;
+			unsigned int b;
+			unsigned int c;
+			unsigned int d;
+		} u_32;
+		struct {
+			uint64_t a;
+			uint64_t b;
+		} u_64;
+
+	} data;
+
+public:
+	GUID()
+		{ make_unique(); }
+	GUID(const GUID& x):data(x.data)
+		{ }
+	GUID(const int i __attribute__ ((unused))){assert(!i); data.u_64.a=0;data.u_64.b=0;}
+
+	GUID(const String& str);
+
+	static GUID zero() { return GUID(0); }
+	static GUID hasher(const String& str);
+	static GUID hasher(int i);
+
+	operator bool()const { return data.u_32.a||data.u_32.b||data.u_32.c||data.u_32.d; }
+
+	uint64_t get_hi()const { return data.u_64.a; }
+	uint64_t get_lo()const { return data.u_64.b; }
+
+	uint64_t get_hi_hi()const { return data.u_32.a; }
+	uint64_t get_hi_lo()const { return data.u_32.b; }
+	uint64_t get_lo_hi()const { return data.u_32.c; }
+	uint64_t get_lo_lo()const { return data.u_32.d; }
+
+	void make_unique();
+	String get_string()const;
+
+	bool operator==(const GUID& rhs)const
+		{ return data.u_64.a==rhs.data.u_64.a && data.u_64.b==rhs.data.u_64.b; }
+	bool operator!=(const GUID& rhs)const
+		{ return data.u_64.a!=rhs.data.u_64.a || data.u_64.b!=rhs.data.u_64.b; }
+	bool operator<(const GUID& rhs)const
+		{ return (data.u_64.a==rhs.data.u_64.a)?(data.u_64.b<rhs.data.u_64.b):(data.u_64.a<rhs.data.u_64.a); }
+	bool operator>(const GUID& rhs)const
+		{ return (data.u_64.a==rhs.data.u_64.a)?(data.u_64.b>rhs.data.u_64.b):(data.u_64.a>rhs.data.u_64.a); }
+	bool operator<=(const GUID& rhs)const
+		{ return operator<(rhs) || operator==(rhs); }
+	bool operator>=(const GUID& rhs)const
+		{ return operator>(rhs) || operator==(rhs); }
+
+	//! Operator '^' (xor)
+	/*! If A ^ B == C, then C ^ B == A and B ^ A == C.
+	**	Also keep in mind that A ^ A == 0 and A ^ B ^ B = A. */
+	GUID& operator^=(const GUID& rhs)
+	{
+		data.u_32.a^=rhs.data.u_32.a;
+		data.u_32.b^=rhs.data.u_32.b;
+		data.u_32.c^=rhs.data.u_32.c;
+		data.u_32.d^=rhs.data.u_32.d;
+		return *this;
+	}
+	GUID operator^(const GUID& rhs)const { return GUID(*this)^=rhs; }
+
+	//! Operator '%' (alt-xor)
+	/*! A % B != B % A. */
+	GUID& operator%=(const GUID& rhs)
+	{
+		data.u_32.a^=rhs.data.u_32.b;
+		data.u_32.b^=rhs.data.u_32.c;
+		data.u_32.c^=rhs.data.u_32.d;
+		data.u_32.d^=rhs.data.u_32.a;
+		return *this;
+	}
+	GUID operator%(const GUID& rhs)const { return GUID(*this)%=rhs; }
+
+};
+
+class GUIDHash
+{
+public:
+	size_t operator()(const GUID& guid)const
+	{
+		return
+			guid.get_hi_hi()+
+			guid.get_hi_lo()+
+			guid.get_lo_hi()+
+			guid.get_lo_lo();
+	}
+};
+
+};
+
+/* === E N D =============================================================== */
+
+#endif