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diff --git a/src/core/expression/RBAObjectReference.hpp b/src/core/expression/RBAObjectReference.hpp
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+++ b/src/core/expression/RBAObjectReference.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.
+ */
+
+/// ObjectReference class header
+
+#ifndef RBAOBJECTREFERENCE_HPP
+#define RBAOBJECTREFERENCE_HPP
+
+#include "RBAExpression.hpp"
+
+namespace rba
+{
+
+class DLL_EXPORT RBAObjectReference : public RBAExpression
+{
+public:
+  RBAObjectReference()=default;
+  RBAObjectReference(const RBAObjectReference&)=delete;
+  RBAObjectReference(const RBAObjectReference&&)=delete;
+  RBAObjectReference& operator=(const RBAObjectReference&)=delete;
+  RBAObjectReference& operator=(const RBAObjectReference&&)=delete;
+  virtual ~RBAObjectReference()=default;
+
+public:
+  void accept(RBAExpressionVisitor& visitor) override;
+  RBAModelElementType getModelElementType() const override;
+  const RBARuleObject* getReferenceObjectCore(RBAConstraintInfo* info,
+                                                      RBAArbitrator* arb) const override;
+  void setRefObject(const RBARuleObject* const newRefObject);
+
+  // Log
+#ifdef RBA_USE_LOG
+  void setExpressionType(RBAExpressionType const newExprType);
+  void createHierarchy() override;
+  const std::string getExpressionText() const override;
+  RBAExpressionType getUnderlyingType() const override;
+  const std::string getCoverageExpressionText() const override;
+#endif
+
+private:
+  const RBARuleObject* refObject_;
+#ifdef RBA_USE_LOG
+  RBAExpressionType expressionType_;
+#endif
+
+};
+
+}
+
+#endif