diff --git a/src/libdanbooru/danbooru.h b/src/libdanbooru/danbooru.h
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+++ b/src/libdanbooru/danbooru.h
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+/*
+ * This file is part of libdanbooru.
+ * Copyright 2013  Luca Beltrame <lbeltrame@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef DANBOORU_H
+#define DANBOORU_H
+
+#include <QtCore/QObject>
+
+#include "version.h"
+
+/**
+ * @brief The Danbooru namespace.
+ * @file danbooru.h
+ *
+ **/
+namespace Danbooru {
+
+    /**
+     * @brief Types of tags
+     *
+     * A Danbooru tag is not simply a string, but carries some (limited)
+     * semantic information. In particular, tags are organized in what they
+     * refer to, either something related to the image itself, or to the
+     * artist that drew it, or the copyrights associated to the image, or even
+     * the characters that are represented in it.
+     *
+     **/
+    enum TagType {
+          General = 1, /**< Generic tags **/
+          Artist = 2, /**< Tags related to artists **/
+          Copyright = 4, /**<Tags related to copyrights **/
+          Character= 8, /**<Tags related to characters **/
+          Unknown = 16 /**< Unknown tags **/
+    };
+
+
+    /**
+     * @brief Ratings for a Danbooru item
+     *
+     * A rating is how appropriate is an item for a general audience.
+     *
+     **/
+    enum Rating {
+        Safe = 1, /**< Safe for the general public **/
+        Questionable = 2, /**< Might contain hints of risqueness of violence **/
+        Explicit = 4 /**< Explicit material **/
+     };
+
+    Q_DECLARE_FLAGS(Ratings, Rating)
+    Q_DECLARE_OPERATORS_FOR_FLAGS(Ratings)
+
+}; // namespace Danbooru
+
+#endif // DANBOORU_H