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diff --git a/src/lib/yang/adaptor_host.h b/src/lib/yang/adaptor_host.h
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+++ b/src/lib/yang/adaptor_host.h
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+// Copyright (C) 2018-2022 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 ISC_ADAPTOR_HOST_H
+#define ISC_ADAPTOR_HOST_H 1
+
+#include <yang/adaptor.h>
+
+namespace isc {
+namespace yang {
+
+/// @brief JSON adaptor for host reservations quoting identifiers.
+///
+/// The identifier type and identifier value are used as keys in YANG
+/// host reservation lists so some constraints were put on their contents.
+/// For instance a quoted flex-id identifier raises an error (keys
+/// are between quotes in setItem commands).
+class AdaptorHost {
+public:
+
+    /// @brief The string of standard (vs special or not printable)
+    /// characters (digit, letters, -, ., @, _).
+    static const std::string STD_CHARACTERS;
+
+    /// @brief Constructor.
+    AdaptorHost();
+
+    /// @brief Destructor.
+    virtual ~AdaptorHost();
+
+    /// @brief Quote when needed a host identifier.
+    ///
+    /// Check if the flex-id identifier includes a special (including quote)
+    /// or not printable character. When it is the case produce and replace
+    /// by a hexadecimal identifier trying first for a quoted identifier.
+    ///
+    /// @param host The host.
+    static void quoteIdentifier(isc::data::ElementPtr host);
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_ADAPTOR_HOST_H