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diff --git a/src/lib/cc/user_context.h b/src/lib/cc/user_context.h
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+++ b/src/lib/cc/user_context.h
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+// Copyright (C) 2017-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef USER_CONTEXT_H
+#define USER_CONTEXT_H
+
+#include <cc/data.h>
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace data {
+
+/// @brief Base class for user context
+///
+/// Many configuration structures allow attaching and storing arbitrary
+/// user data that we call user context. Each of those configuration
+/// structures need to derive from this class or include this class
+/// to handle user context.
+struct UserContext {
+    /// @brief Returns const pointer to the user context.
+    data::ConstElementPtr getContext() const {
+        return (user_context_);
+    }
+
+    /// @brief Sets user context.
+    /// @param ctx user context to be stored.
+    void setContext(const data::ConstElementPtr& ctx) {
+        user_context_ = ctx;
+    }
+
+    /// @brief Merge unparse a user_context object.
+    ///
+    /// Add user-context to map, but only if defined. Omit if it was not.
+    ///
+    /// @param map A pointer to map where the user context will be unparsed.
+    void contextToElement(data::ElementPtr map) const;
+
+    /// @brief Copy an Element map
+    ///
+    /// A previous version of this extracted comments.
+    ///
+    /// @param map A pointer to map.
+    /// @return a copy of map
+    static data::ElementPtr toElement(data::ConstElementPtr map);
+
+protected:
+
+    /// @brief Pointer to the user context (may be NULL)
+    data::ConstElementPtr user_context_;
+};
+
+} // end of isc::dhcp namespace
+} // end of isc namespace
+
+
+#endif // USER_CONTEXT_H