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diff --git a/src/2geom/exception.h b/src/2geom/exception.h
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+/**
+ * \file
+ * \brief  Defines the different types of exceptions that 2geom can throw.
+ *
+ * There are two main exception classes: LogicalError and RangeError.
+ * Logical errors are 2geom faults/bugs; RangeErrors are 'user' faults,
+ * e.g. invalid arguments to lib2geom methods.
+ * This way, the 'user' can distinguish between groups of exceptions
+ * ('user' is the coder that uses lib2geom)
+ *
+ * Several macro's are defined for easily throwing exceptions 
+ * (e.g. THROW_CONTINUITYERROR). 
+ */
+/* Copyright 2007 Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ */
+
+#ifndef LIB2GEOM_SEEN_EXCEPTION_H
+#define LIB2GEOM_SEEN_EXCEPTION_H
+
+#include <exception>
+#include <sstream>
+#include <string>
+
+namespace Geom {
+
+/**
+ * Base exception class, all 2geom exceptions should be derived from this one.
+ */
+class Exception : public std::exception {
+public:
+    Exception(const char * message, const char *file, const int line) {
+        std::ostringstream os;
+        os << "lib2geom exception: " << message << " (" << file << ":" << line << ")";
+        msgstr = os.str();
+    }
+
+    virtual ~Exception() throw() {} // necessary to destroy the string object!!!
+
+    virtual const char* what() const throw () {
+        return msgstr.c_str();
+    }
+protected:
+    std::string msgstr;
+};
+#define THROW_EXCEPTION(message) throw(Geom::Exception(message, __FILE__, __LINE__))
+
+//-----------------------------------------------------------------------
+
+class LogicalError : public Exception {
+public:
+    LogicalError(const char * message, const char *file, const int line)
+        : Exception(message, file, line) {}
+};
+#define THROW_LOGICALERROR(message) throw(LogicalError(message, __FILE__, __LINE__))
+
+class RangeError : public Exception {
+public:
+    RangeError(const char * message, const char *file, const int line)
+        : Exception(message, file, line) {}
+};
+#define THROW_RANGEERROR(message) throw(RangeError(message, __FILE__, __LINE__))
+
+//-----------------------------------------------------------------------
+// Special case exceptions. Best used with the defines :)
+
+class NotImplemented : public LogicalError {
+public:
+    NotImplemented(const char *file, const int line)
+        : LogicalError("Method not implemented", file, line) {}
+};
+#define THROW_NOTIMPLEMENTED(i) throw(NotImplemented(__FILE__, __LINE__))
+
+class InvariantsViolation : public LogicalError {
+public:
+    InvariantsViolation(const char *file, const int line)
+        : LogicalError("Invariants violation", file, line) {}
+};
+#define THROW_INVARIANTSVIOLATION(i) throw(InvariantsViolation(__FILE__, __LINE__))
+#define ASSERT_INVARIANTS(e)       ((e) ? (void)0 : THROW_INVARIANTSVIOLATION())
+
+class NotInvertible : public RangeError {
+public:
+    NotInvertible(const char *file, const int line)
+        : RangeError("Function does not have a unique inverse", file, line) {}
+};
+#define THROW_NOTINVERTIBLE(i) throw(NotInvertible(__FILE__, __LINE__))
+
+class InfiniteSolutions : public RangeError {
+public:
+	InfiniteSolutions(const char *file, const int line)
+        : RangeError("There are infinite solutions", file, line) {}
+};
+#define THROW_INFINITESOLUTIONS(i) throw(InfiniteSolutions(__FILE__, __LINE__))
+
+class ContinuityError : public RangeError {
+public:
+    ContinuityError(const char *file, const int line)
+        : RangeError("Non-contiguous path", file, line) {}
+};
+#define THROW_CONTINUITYERROR(i) throw(ContinuityError(__FILE__, __LINE__))
+
+struct SVGPathParseError : public std::exception {
+    char const *what() const throw() { return "parse error"; }
+};
+
+
+} // namespace Geom
+
+#endif
+
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :