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diff --git a/starmath/inc/mathml/mathmlMo.hxx b/starmath/inc/mathml/mathmlMo.hxx
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+++ b/starmath/inc/mathml/mathmlMo.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 .
+ */
+
+/*
+ Warning: The SvXMLElementExport helper class creates the beginning and
+ closing tags of xml elements in its constructor and destructor, so there's
+ hidden stuff going on, on occasion the ordering of these classes declarations
+ may be significant
+*/
+
+#pragma once
+
+#include <sal/types.h>
+#include <rtl/ustring.hxx>
+#include <vector>
+
+// https://www.w3.org/TR/MathML3/appendixc.html
+
+enum class moOpDP : sal_uInt16
+{ // moOperatorDataProperty
+    nonedp = 0x0000,
+    accent = 0x0001,
+    fence = 0x0002,
+    stretchy = 0x0004,
+    symmetric = 0x0008,
+    separator = 0x0010,
+    linebreakstyleAfter = 0x0020,
+    largeop = 0x0080,
+    movablelimits = 0x0100,
+    starmathCustom = 0x0200,
+    starmathCustomMo = 0x0400,
+    stretchyfence = 0x0006,
+    movablelargeop = 0x0180
+};
+
+enum class moOpDF : sal_uInt16
+{ // moOperatorDataForm
+    nonedf = 0x0000,
+    prefix = 0x0001,
+    infix = 0x0002,
+    postfix = 0x0004,
+    prepostfix = 0x0005
+};
+
+struct moOperatorData
+{
+    OUString m_motxt;
+    moOpDF m_form;
+    sal_uInt16 m_priority;
+    sal_uInt16 m_lspace;
+    sal_uInt16 m_rspace;
+    moOpDP m_properties;
+
+    moOperatorData(OUString motxt, moOpDF form, sal_uInt16 priority, sal_uInt16 lspace,
+                   sal_uInt16 rspace, moOpDP properties)
+        : m_motxt(motxt)
+        , m_form(form)
+        , m_priority(priority)
+        , m_lspace(lspace)
+        , m_rspace(rspace)
+        , m_properties(properties)
+    {
+    }
+};
+
+inline moOpDF operator|(moOpDF a, moOpDF b)
+{
+    return static_cast<moOpDF>(static_cast<sal_uInt16>(a) | static_cast<sal_uInt16>(b));
+}
+
+inline moOpDF operator&(moOpDF a, moOpDF b)
+{
+    return static_cast<moOpDF>(static_cast<sal_uInt16>(a) & static_cast<sal_uInt16>(b));
+}
+
+inline moOpDP operator|(moOpDP a, moOpDP b)
+{
+    return static_cast<moOpDP>(static_cast<sal_uInt16>(a) | static_cast<sal_uInt16>(b));
+}
+
+inline moOpDP operator&(moOpDP a, moOpDP b)
+{
+    return static_cast<moOpDP>(static_cast<sal_uInt16>(a) & static_cast<sal_uInt16>(b));
+}
+
+namespace starmathdatabase
+{
+constexpr size_t MATHML_MO_COUNT = 1100;
+
+extern std::vector<moOperatorData> moOperatorDataDictionary;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */