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diff --git a/src/attribute-rel-css.h b/src/attribute-rel-css.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#ifndef __SP_ATTRIBUTE_REL_CSS_H__
+#define __SP_ATTRIBUTE_REL_CSS_H__
+
+/*
+ * attribute-rel-css.h
+ *
+ *  Created on: Jul 25, 2011
+ *      Author: abhishek
+ */
+
+#include <string>
+#include <map>
+#include <set>
+#include <glibmm/ustring.h>
+
+// This data structure stores the valid (element -> set of CSS properties) pair
+typedef std::map<Glib::ustring, std::set<Glib::ustring> > hashList;
+
+/*
+ * Utility class that helps check whether a given element -> CSS property is 
+ * valid or not and whether the value assumed by a CSS property has a default
+ * value.
+ */
+class SPAttributeRelCSS {
+public:
+    static bool findIfValid(Glib::ustring property, Glib::ustring element);
+    static bool findIfDefault(Glib::ustring property, Glib::ustring value);
+    static bool findIfInherit(Glib::ustring property);
+    static bool findIfProperty(Glib::ustring property);
+
+private:
+    SPAttributeRelCSS();
+    SPAttributeRelCSS(const SPAttributeRelCSS&) = delete;
+    SPAttributeRelCSS& operator= (const SPAttributeRelCSS&) = delete;
+
+private:
+    /* 
+     * Allows checking whether data loading is to be done for element -> CSS properties
+     * or CSS property -> default value.
+     */
+    enum storageType {
+        prop_element_pair,
+        prop_defValue_pair
+    };
+    static SPAttributeRelCSS *instance;
+    static bool foundFileProp;
+    static bool foundFileDefault;
+    hashList propertiesOfElements;
+
+    // Data structure to store CSS property and default value pair
+    std::map<Glib::ustring, Glib::ustring> defaultValuesOfProps;
+    std::map<Glib::ustring, gboolean> inheritProps;
+    bool readDataFromFileIn(Glib::ustring fileName, storageType type);
+};
+
+
+#endif /* __SP_ATTRIBUTE_REL_CSS_H__ */
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :