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diff --git a/include/formula/ExternalReferenceHelper.hxx b/include/formula/ExternalReferenceHelper.hxx
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+++ b/include/formula/ExternalReferenceHelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef FORMULA_EXTERNALREFERENCEHELPER_HXX
+#define FORMULA_EXTERNALREFERENCEHELPER_HXX
+
+#include <rtl/ustring.hxx>
+#include "formula/formuladllapi.h"
+
+namespace formula
+{
+    class FORMULA_DLLPUBLIC SAL_NO_VTABLE ExternalReferenceHelper
+    {
+        public:
+            virtual OUString getCacheTableName(sal_uInt16 nFileId, size_t nTabIndex) const = 0;
+
+        protected:
+            ~ExternalReferenceHelper() {}
+    };
+// =============================================================================
+} // formula
+// =============================================================================
+#endif //FORMULA_EXTERNALREFERENCEHELPER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */