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diff --git a/starmath/inc/mathml/xparsmlbase.hxx b/starmath/inc/mathml/xparsmlbase.hxx
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+++ b/starmath/inc/mathml/xparsmlbase.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 <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/beans/Pair.hpp>
+namespace starmathdatabase
+{
+/**
+  * w3 documentation has been used for this.
+  * See: https://www.w3.org/2003/entities/2007/htmlmathml-f.ent
+  * Copyright 1998 - 2011 W3C.
+  * We allow the import of HTML5 entities because are compatible with mathml
+  * and ill formatted are expected.
+  * On export only mathml entities are allowed.
+  * Some documentation: https://www.w3.org/TR/MathML3/chapter7.html
+  */
+
+constexpr sal_Int32 STARMATH_MATHMLHTML_ENTITY_NUMBER = 2125;
+
+/**
+  * Entity names for mathml. Example: &infin -> \u221E;
+  * These ones are to be used on import.
+  */
+const extern ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>
+    icustomMathmlHtmlEntities;
+
+/**
+  * Entity names for mathml. Example: "\u221E"; -> &infin;
+  * These ones are to be used on file export.
+  */
+const extern ::css::uno::Sequence<::css::beans::Pair<::rtl::OUString, ::rtl::OUString>>
+    icustomMathmlHtmlEntitiesExport;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */