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diff --git a/src/transformations/defmodel_exceptions.hpp b/src/transformations/defmodel_exceptions.hpp
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+/******************************************************************************
+ * Project:  PROJ
+ * Purpose:  Functionality related to deformation model
+ * Author:   Even Rouault, <even.rouault at spatialys.com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2020, Even Rouault, <even.rouault at spatialys.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *****************************************************************************/
+
+#ifndef DEFORMATON_MODEL_NAMESPACE
+#error "Should be included only by defmodel.hpp"
+#endif
+
+#include <exception>
+
+namespace DEFORMATON_MODEL_NAMESPACE {
+
+// ---------------------------------------------------------------------------
+
+/** Parsing exception. */
+class ParsingException : public std::exception {
+  public:
+    ParsingException(const std::string &msg) : msg_(msg) {}
+    const char *what() const noexcept override;
+
+  private:
+    std::string msg_;
+};
+
+const char *ParsingException::what() const noexcept { return msg_.c_str(); }
+
+// ---------------------------------------------------------------------------
+
+class UnimplementedException : public std::exception {
+  public:
+    UnimplementedException(const std::string &msg) : msg_(msg) {}
+    const char *what() const noexcept override;
+
+  private:
+    std::string msg_;
+};
+
+const char *UnimplementedException::what() const noexcept {
+    return msg_.c_str();
+}
+
+// ---------------------------------------------------------------------------
+
+/** Evaluator exception. */
+class EvaluatorException : public std::exception {
+  public:
+    EvaluatorException(const std::string &msg) : msg_(msg) {}
+    const char *what() const noexcept override;
+
+  private:
+    std::string msg_;
+};
+
+const char *EvaluatorException::what() const noexcept { return msg_.c_str(); }
+
+// ---------------------------------------------------------------------------
+
+} // namespace DEFORMATON_MODEL_NAMESPACE