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diff --git a/src/iso19111/operation/parammappings.hpp b/src/iso19111/operation/parammappings.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 PARAMMAPPINGS_HPP
+#define PARAMMAPPINGS_HPP
+
+#ifndef FROM_PROJ_CPP
+#define FROM_PROJ_CPP
+#endif
+
+#include "proj/coordinateoperation.hpp"
+#include "proj/util.hpp"
+
+// ---------------------------------------------------------------------------
+
+NS_PROJ_START
+namespace operation {
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
+
+extern const char *WKT1_LATITUDE_OF_ORIGIN;
+extern const char *WKT1_CENTRAL_MERIDIAN;
+extern const char *WKT1_SCALE_FACTOR;
+extern const char *WKT1_FALSE_EASTING;
+extern const char *WKT1_FALSE_NORTHING;
+extern const char *WKT1_STANDARD_PARALLEL_1;
+extern const char *WKT1_STANDARD_PARALLEL_2;
+extern const char *WKT1_LATITUDE_OF_CENTER;
+extern const char *WKT1_LONGITUDE_OF_CENTER;
+extern const char *WKT1_AZIMUTH;
+extern const char *WKT1_RECTIFIED_GRID_ANGLE;
+
+struct ParamMapping {
+    const char *wkt2_name;
+    const int epsg_code;
+    const char *wkt1_name;
+    const common::UnitOfMeasure::Type unit_type;
+    const char *proj_name;
+};
+
+struct MethodMapping {
+    const char *wkt2_name;
+    const int epsg_code;
+    const char *wkt1_name;
+    const char *proj_name_main;
+    const char *proj_name_aux;
+    const ParamMapping *const *params;
+};
+
+extern const ParamMapping paramLatitudeNatOrigin;
+
+const MethodMapping *getProjectionMethodMappings(size_t &nElts);
+const MethodMapping *getOtherMethodMappings(size_t &nElts);
+
+struct MethodNameCode {
+    const char *name;
+    int epsg_code;
+};
+
+const MethodNameCode *getMethodNameCodes(size_t &nElts);
+
+struct ParamNameCode {
+    const char *name;
+    int epsg_code;
+};
+
+const ParamNameCode *getParamNameCodes(size_t &nElts);
+
+const MethodMapping *getMapping(int epsg_code) noexcept;
+const MethodMapping *getMappingFromWKT1(const std::string &wkt1_name) noexcept;
+const MethodMapping *getMapping(const char *wkt2_name) noexcept;
+const MethodMapping *getMapping(const OperationMethod *method) noexcept;
+std::vector<const MethodMapping *>
+getMappingsFromPROJName(const std::string &projName);
+const ParamMapping *getMapping(const MethodMapping *mapping,
+                               const OperationParameterNNPtr &param);
+const ParamMapping *getMappingFromWKT1(const MethodMapping *mapping,
+                                       const std::string &wkt1_name);
+
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+} // namespace operation
+NS_PROJ_END
+
+#endif // PARAMMAPPINGS_HPP