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diff --git a/src/iso19111/operation/operationmethod_private.hpp b/src/iso19111/operation/operationmethod_private.hpp
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+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  ISO19111:2019 implementation
+ * Author:   Even Rouault <even dot rouault at spatialys dot com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2018, Even Rouault <even dot rouault at spatialys dot 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 OPERATIONMETHOD_PRIVATE_HPP
+#define OPERATIONMETHOD_PRIVATE_HPP
+
+#include "proj/coordinateoperation.hpp"
+#include "proj/util.hpp"
+
+// ---------------------------------------------------------------------------
+
+NS_PROJ_START
+namespace operation {
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
+struct OperationMethod::Private {
+    util::optional<std::string> formula_{};
+    util::optional<metadata::Citation> formulaCitation_{};
+    std::vector<GeneralOperationParameterNNPtr> parameters_{};
+    std::string projMethodOverride_{};
+};
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+} // namespace operation
+NS_PROJ_END
+
+#endif // OPERATIONMETHOD_PRIVATE_HPP