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diff --git a/compiler/locomotiv/include/locomotiv/NodeData.h b/compiler/locomotiv/include/locomotiv/NodeData.h
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+++ b/compiler/locomotiv/include/locomotiv/NodeData.h
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+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * 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.
+ */
+
+#ifndef _LOCOMOTIV_NODEDATA_H_
+#define _LOCOMOTIV_NODEDATA_H_
+
+#include <loco.h>
+#include <nncc/core/ADT/tensor/Buffer.h>
+#include <nncc/core/ADT/tensor/Shape.h>
+
+#include <memory>
+
+namespace locomotiv
+{
+
+/**
+ * @brief Read-only no-template wrapper for 'Buffer'. Serves interface for input
+ *        and output of 'Session'.
+ *
+ * @note Once NodeData is created, it is not modifiable.
+ */
+struct NodeData
+{
+  template <typename T> using Buffer = nncc::core::ADT::tensor::Buffer<T>;
+  using Shape = nncc::core::ADT::tensor::Shape;
+
+  virtual ~NodeData() = default;
+
+  virtual const loco::DataType &dtype() const = 0;
+
+  virtual const Shape *shape() const = 0;
+
+  // TODO Support more data types
+  virtual const Buffer<int32_t> *as_s32_bufptr() const = 0;
+  virtual const Buffer<float> *as_f32_bufptr() const = 0;
+};
+
+/**
+ * @brief Copy buffer to make NodeData
+ *
+ * @note NodeData is read-only. You may prepare buffer with ALL data, then call
+ *       this function to make data.
+ */
+template <typename DT> std::unique_ptr<NodeData> make_data(const NodeData::Buffer<DT> &buffer);
+
+} // namespace locomotiv
+
+#endif // _LOCOMOTIV_NODEDATA_H_