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diff --git a/utils/config/keys.cpp b/utils/config/keys.cpp
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+++ b/utils/config/keys.cpp
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+// Copyright 2012 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "utils/config/tree.ipp"
+
+#include "utils/config/exceptions.hpp"
+#include "utils/format/macros.hpp"
+#include "utils/text/operations.hpp"
+
+namespace config = utils::config;
+namespace text = utils::text;
+
+
+/// Converts a key to its textual representation.
+///
+/// \param key The key to convert.
+///
+/// \return a flattened representation of \p key, "."-joined.
+std::string
+utils::config::detail::flatten_key(const tree_key& key)
+{
+    PRE(!key.empty());
+    return text::join(key, ".");
+}
+
+
+/// Parses and validates a textual key.
+///
+/// \param str The key to process in dotted notation.
+///
+/// \return The tokenized key if valid.
+///
+/// \throw invalid_key_error If the input key is empty or invalid for any other
+///     reason.  Invalid does NOT mean unknown though.
+utils::config::detail::tree_key
+utils::config::detail::parse_key(const std::string& str)
+{
+    const tree_key key = text::split(str, '.');
+    if (key.empty())
+        throw invalid_key_error("Empty key");
+    for (tree_key::const_iterator iter = key.begin(); iter != key.end(); iter++)
+        if ((*iter).empty())
+            throw invalid_key_error(F("Empty component in key '%s'") % str);
+    return key;
+}