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diff --git a/src/lib/cc/cfg_to_element.h b/src/lib/cc/cfg_to_element.h
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+++ b/src/lib/cc/cfg_to_element.h
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+// Copyright (C) 2017 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 CFG_TO_ELEMENT_H
+#define CFG_TO_ELEMENT_H
+
+#include <exceptions/exceptions.h>
+#include <cc/data.h>
+
+namespace isc {
+
+/// @brief Cannot unparse error
+///
+/// This exception is expected to be thrown when toElement fails
+/// and to skip flawed elements is not wanted.
+class ToElementError : public isc::Exception {
+public:
+    ToElementError(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+namespace data {
+
+/// @brief Abstract class for configuration Cfg_* classes
+///
+struct CfgToElement {
+    /// Destructor
+    virtual ~CfgToElement() { }
+
+    /// @brief Unparse a configuration object
+    ///
+    /// Returns an element which must parse into the same object, i.e.
+    /// @code
+    /// for all valid config C parse(parse(C)->toElement()) == parse(C)
+    /// @endcode
+    ///
+    /// @return a pointer to a configuration which can be parsed into
+    /// the initial configuration object
+    virtual isc::data::ElementPtr toElement() const = 0;
+};
+
+}; // namespace isc::dhcp
+}; // namespace isc
+
+#endif // CFG_TO_ELEMENT_H