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diff --git a/forms/source/xforms/boolexpression.hxx b/forms/source/xforms/boolexpression.hxx
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+++ b/forms/source/xforms/boolexpression.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 .
+ */
+
+#pragma once
+
+#include "computedexpression.hxx"
+
+namespace xforms
+{
+/** BoolExpression represents a computed XPath expression that returns
+ * a bool value and caches the results.
+ *
+ * As this class has no virtual methods, it should never be used
+ * polymorphically. */
+class BoolExpression : public ComputedExpression
+{
+public:
+    BoolExpression();
+    ~BoolExpression();
+
+    /// set the expression string
+    /// (overridden for new definition of a simple expression)
+    void setExpression(const OUString& rExpression);
+};
+
+} // namespace xforms
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */