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diff --git a/src/iso19111/operation/oputils.hpp b/src/iso19111/operation/oputils.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 OPUTILS_HPP
+#define OPUTILS_HPP
+
+#include "proj/coordinateoperation.hpp"
+#include "proj/io.hpp"
+#include "proj/metadata.hpp"
+#include "proj/util.hpp"
+
+// ---------------------------------------------------------------------------
+
+NS_PROJ_START
+namespace operation {
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
+
+extern const common::Measure nullMeasure;
+
+extern const std::string INVERSE_OF;
+
+extern const char *BALLPARK_GEOCENTRIC_TRANSLATION;
+extern const char *NULL_GEOGRAPHIC_OFFSET;
+extern const char *NULL_GEOCENTRIC_TRANSLATION;
+extern const char *BALLPARK_GEOGRAPHIC_OFFSET;
+extern const char *BALLPARK_VERTICAL_TRANSFORMATION;
+extern const char *BALLPARK_VERTICAL_TRANSFORMATION_NO_ELLIPSOID_VERT_HEIGHT;
+
+extern const std::string AXIS_ORDER_CHANGE_2D_NAME;
+extern const std::string AXIS_ORDER_CHANGE_3D_NAME;
+
+OperationParameterNNPtr createOpParamNameEPSGCode(int code);
+
+util::PropertyMap createMethodMapNameEPSGCode(int code);
+
+util::PropertyMap createMapNameEPSGCode(const std::string &name, int code);
+
+util::PropertyMap createMapNameEPSGCode(const char *name, int code);
+
+util::PropertyMap &addDomains(util::PropertyMap &map,
+                              const common::ObjectUsage *obj);
+
+std::string buildOpName(const char *opType, const crs::CRSPtr &source,
+                        const crs::CRSPtr &target);
+
+void addModifiedIdentifier(util::PropertyMap &map,
+                           const common::IdentifiedObject *obj, bool inverse,
+                           bool derivedFrom);
+util::PropertyMap
+createPropertiesForInverse(const OperationMethodNNPtr &method);
+
+util::PropertyMap createPropertiesForInverse(const CoordinateOperation *op,
+                                             bool derivedFrom,
+                                             bool approximateInversion);
+
+util::PropertyMap addDefaultNameIfNeeded(const util::PropertyMap &properties,
+                                         const std::string &defaultName);
+
+bool areEquivalentParameters(const std::string &a, const std::string &b);
+
+bool isTimeDependent(const std::string &methodName);
+
+std::string computeConcatenatedName(
+    const std::vector<CoordinateOperationNNPtr> &flattenOps);
+
+metadata::ExtentPtr getExtent(const std::vector<CoordinateOperationNNPtr> &ops,
+                              bool conversionExtentIsWorld,
+                              bool &emptyIntersection);
+
+metadata::ExtentPtr getExtent(const CoordinateOperationNNPtr &op,
+                              bool conversionExtentIsWorld,
+                              bool &emptyIntersection);
+
+const metadata::ExtentPtr &getExtent(const crs::CRSNNPtr &crs);
+
+const metadata::ExtentPtr getExtentPossiblySynthetized(const crs::CRSNNPtr &crs,
+                                                       bool &approxOut);
+
+double getAccuracy(const CoordinateOperationNNPtr &op);
+
+double getAccuracy(const std::vector<CoordinateOperationNNPtr> &ops);
+
+void exportSourceCRSAndTargetCRSToWKT(const CoordinateOperation *co,
+                                      io::WKTFormatter *formatter);
+
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+} // namespace operation
+NS_PROJ_END
+
+#endif // OPUTILS_HPP