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diff --git a/src/core/expression/RBAVariableMaker.hpp b/src/core/expression/RBAVariableMaker.hpp
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+/**
+ * Copyright (c) 2019 DENSO CORPORATION.
+ * 
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/// @file  RBAVariableMaker.cpp
+/// @brief Variable object generator class header
+
+#ifndef RBAVARIABLEMAKER_HPP
+#define RBAVARIABLEMAKER_HPP
+
+#include "RBAModelElementMaker.hpp"
+
+namespace rba
+{
+
+/// @brief Variable object generator class
+class RBAVariableMaker : public RBAModelElementMaker
+{
+public:
+  RBAVariableMaker();
+  RBAVariableMaker(const RBAVariableMaker&)=delete;
+  RBAVariableMaker(const RBAVariableMaker&&)=delete;
+  RBAVariableMaker& operator=(const RBAVariableMaker&)=delete;
+  RBAVariableMaker& operator=(const RBAVariableMaker&&)=delete;
+  virtual ~RBAVariableMaker()=default;
+
+public:
+  /// @brief Create ModelElement object
+  /// @details Create ModelElement object and register unique_ptr to model.
+  /// @param[in] jsonElem JSON element of ModelElement
+  /// @param[in] model The model to store created object
+  /// @param[in,out] owner Parent object (Not in use)
+  /// @return ModelElement object
+  RBAModelElement* create(const RBAJsonElement* jsonElem,
+                          RBAModelImpl* model,
+                          RBAModelElement* owner=nullptr) override;
+
+protected:
+  /// @brief generate an empty instance
+  /// @details generate an empty instance of unique_ptr in derived class
+  /// @return unique_ptr for instance
+  std::unique_ptr<RBAModelElement> createInstance(const std::string& name="") override;
+
+  /// @brief Set attributes of model element for each derived class
+  /// @param[in] jsonElem JSON element of ModelElement
+  /// @param[in] model The model to store created object
+  /// @param[in,out] owner Parent object (Not in use)
+  /// @return ModelElement object
+  RBAModelElement* setProperty(RBAModelElement* element,
+                               const RBAJsonElement* jsonElem,
+                               RBAModelImpl* model,
+                               RBAModelElement* owner=nullptr) override;
+
+};
+
+}
+
+#endif