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diff --git a/starmath/inc/mathml/def.hxx b/starmath/inc/mathml/def.hxx
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+++ b/starmath/inc/mathml/def.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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/.
+ */
+
+#pragma once
+
+#include <tools/color.hxx>
+
+/* All possible data needed to do the job outside mathml limits */
+// Ml prefix means it is part of mathml standard
+// NMl means it is not part of mathml standard but needed info to work
+
+/* For now empty, don't know yet what's needed besides default font size. */
+struct SmGlobalData
+{
+};
+
+/* Mhtml length tools */
+/*************************************************************************************************/
+
+enum class SmLengthUnit : uint_fast8_t
+{
+    MlEm,
+    MlEx,
+    MlPx,
+    MlIn,
+    MlCm,
+    MlMm,
+    MlPt,
+    MlPc,
+    MlP, // Percent
+    MlM // Multiplier
+};
+
+struct SmLengthValue
+{
+    SmLengthUnit m_aLengthUnit;
+    double m_aLengthValue;
+    // Keeps original text value to avoid numerical error data loss
+    OUString* m_aOriginalText;
+};
+
+/* Possible mathml elements */
+/*************************************************************************************************/
+
+enum class SmMlElementType : uint_fast8_t
+{
+    // Used for base element. Means no information contained.
+    NMlEmpty,
+    // Used for structural dependencies. Means no information contained.
+    NMlStructural,
+    NMlSmNode,
+    // Mathml real elements
+    MlMath,
+    MlMi,
+    MlMerror,
+    MlMn,
+    MlMo,
+    MlMrow,
+    MlMtext,
+    MlMstyle
+};
+
+/* Possible mathml attributes */
+/*************************************************************************************************/
+
+enum class SmMlAttributeValueType : uint_fast8_t
+{
+    NMlEmpty,
+    MlAccent,
+    MlDir,
+    MlDisplaystyle,
+    MlFence,
+    MlForm,
+    MlHref,
+    MlLspace,
+    MlMathbackground,
+    MlMathcolor,
+    MlMathsize,
+    MlMathvariant,
+    MlMaxsize,
+    MlMinsize,
+    MlMovablelimits,
+    MlRspace,
+    MlSeparator,
+    MlStretchy,
+    MlSymmetric
+};
+
+/* Possible values of mathml attributes */
+/*************************************************************************************************/
+
+enum class SmMlAttributeValueEmpty : uint_fast8_t
+{
+    MlEmpty = 0x00
+};
+
+enum class SmMlAttributeValueAccent : uint_fast8_t
+{
+    MlFalse = 0x00,
+    MlTrue = 0x01
+};
+
+enum class SmMlAttributeValueDir : uint_fast8_t
+{
+    MlLtr = 0x00,
+    MlRtl = 0x01
+};
+
+enum class SmMlAttributeValueDisplaystyle : uint_fast8_t
+{
+    MlFalse = 0x00,
+    MlTrue = 0x01
+};
+
+enum class SmMlAttributeValueFence : uint_fast8_t
+{
+    MlFalse = 0x00,
+    MlTrue = 0x01
+};
+
+enum class SmMlAttributeValueForm : uint_fast8_t
+{
+    MlPrefix = 0x01,
+    MlInfix = 0x02,
+    MlPosfix = 0x04
+};
+
+enum class SmMlAttributeValueHref : uint_fast8_t
+{
+    NMlEmpty = 0x00,
+    NMlValid = 0x01
+};
+
+enum class SmMlAttributeValueLspace : uint_fast8_t
+{
+    NMlEmpty = 0x00
+};
+
+enum class SmMlAttributeValueMathbackground : uint_fast32_t
+{
+    MlTransparent = 0x00,
+    MlRgb = 0x01
+};
+
+enum class SmMlAttributeValueMathcolor : uint_fast8_t
+{
+    MlDefault = 0x00,
+    MlRgb = 0x01
+};
+
+enum class SmMlAttributeValueMathsize : uint_fast8_t
+{
+    NMlEmpty = 0x00,
+};
+
+enum class SmMlAttributeValueMathvariant : uint_fast16_t
+{
+    normal = 0x000,
+    bold = 0x001,
+    italic = 0x002,
+    double_struck = 0x004,
+    script = 0x008,
+    fraktur = 0x010,
+    sans_serif = 0x020,
+    monospace = 0x040,
+    bold_italic = 0x001 | 0x002,
+    bold_fraktur = 0x001 | 0x010,
+    bold_script = 0x001 | 0x008,
+    bold_sans_serif = 0x001 | 0x020,
+    sans_serif_italic = 0x002 | 0x20,
+    sans_serif_bold_italic = 0x001 | 0x002 | 0x020,
+    // Non english
+    initial = 0x080,
+    tailed = 0x100,
+    looped = 0x200,
+    stretched = 0x400
+};
+
+enum class SmMlAttributeValueMaxsize : uint_fast8_t
+{
+    MlInfinity = 0x00,
+    MlFinite = 0x01
+};
+
+/*
+ * Specifies whether attached under- and overscripts move to sub- and superscript positions when displaystyle is false.
+ * Source: https://developer.mozilla.org/en-US/docs/Web/MathML/Element/mo
+ */
+enum class SmMlAttributeValueMovablelimits : uint_fast8_t
+{
+    MlFalse = 0x00,
+    MlTrue = 0x01
+};
+
+enum class SmMlAttributeValueRspace : uint_fast8_t
+{
+    NMlEmpty = 0x00
+};
+
+enum class SmMlAttributeValueSeparator : uint_fast8_t
+{
+    MlFalse = 0x00,
+    MlTrue = 0x01
+};
+
+enum class SmMlAttributeValueStretchy : uint_fast8_t
+{
+    MlFalse = 0x00,
+    MlTrue = 0x01
+};
+
+enum class SmMlAttributeValueSymmetric : uint_fast8_t
+{
+    MlFalse = 0x00,
+    MlTrue = 0x01
+};
+
+/* Structures for all possible attributes */
+/*************************************************************************************************/
+
+struct SmMlAccent
+{
+    SmMlAttributeValueAccent m_aAccent;
+};
+
+struct SmMlDir
+{
+    SmMlAttributeValueDir m_aDir;
+};
+
+struct SmMlDisplaystyle
+{
+    SmMlAttributeValueDisplaystyle m_aDisplaystyle;
+};
+
+struct SmMlFence
+{
+    SmMlAttributeValueFence m_aFence;
+};
+
+struct SmMlForm
+{
+    SmMlAttributeValueForm m_aForm;
+};
+
+struct SmMlHref
+{
+    SmMlAttributeValueHref m_aHref;
+    OUString* m_aLnk;
+};
+
+struct SmMlLspace
+{
+    SmLengthValue m_aLengthValue;
+};
+
+struct SmMlMathbackground
+{
+    SmMlAttributeValueMathbackground m_aMathbackground;
+    Color m_aCol;
+};
+
+struct SmMlMathcolor
+{
+    SmMlAttributeValueMathcolor m_aMathcolor;
+    Color m_aCol;
+};
+
+struct SmMlMathsize
+{
+    SmLengthValue m_aLengthValue;
+};
+
+struct SmMlMathvariant
+{
+    SmMlAttributeValueMathvariant m_aMathvariant;
+};
+
+struct SmMlMaxsize
+{
+    SmMlAttributeValueMaxsize m_aMaxsize;
+    SmLengthValue m_aLengthValue;
+};
+
+struct SmMlMinsize
+{
+    SmLengthValue m_aLengthValue;
+};
+
+struct SmMlMovablelimits
+{
+    SmMlAttributeValueMovablelimits m_aMovablelimits;
+};
+
+struct SmMlRspace
+{
+    SmLengthValue m_aLengthValue;
+};
+
+struct SmMlSeparator
+{
+    SmMlAttributeValueSeparator m_aSeparator;
+};
+
+struct SmMlStretchy
+{
+    SmMlAttributeValueStretchy m_aStretchy;
+};
+
+struct SmMlSymmetric
+{
+    SmMlAttributeValueSymmetric m_aSymmetric;
+};
+
+/* order attributes */
+/*************************************************************************************************/
+
+struct SmMlAttributePos
+{
+    SmMlAttributeValueType m_aAttributeValueType;
+    uint_fast8_t m_nPos;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */