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diff --git a/oox/inc/drawingml/chart/seriesconverter.hxx b/oox/inc/drawingml/chart/seriesconverter.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 INCLUDED_OOX_DRAWINGML_CHART_SERIESCONVERTER_HXX
+#define INCLUDED_OOX_DRAWINGML_CHART_SERIESCONVERTER_HXX
+
+#include <drawingml/chart/converterbase.hxx>
+#include <drawingml/chart/seriesmodel.hxx>
+
+namespace com::sun::star {
+    namespace chart2 { class XDataSeries; }
+    namespace chart2::data { class XLabeledDataSequence; }
+}
+
+namespace oox {
+namespace drawingml {
+namespace chart {
+
+class TypeGroupConverter;
+
+// #i66858# enable this when Chart2 supports smoothed lines per data series
+#define OOX_CHART_SMOOTHED_PER_SERIES 0
+
+
+class DataLabelConverter final : public ConverterBase< DataLabelModel >
+{
+public:
+    explicit            DataLabelConverter( const ConverterRoot& rParent, DataLabelModel& rModel );
+    virtual             ~DataLabelConverter() override;
+
+    /** Converts OOXML data label settings for the passed data point. */
+    void                convertFromModel(
+                            const css::uno::Reference< css::chart2::XDataSeries >& rxDataSeries,
+                            const TypeGroupConverter& rTypeGroup );
+};
+
+
+class DataLabelsConverter final : public ConverterBase< DataLabelsModel >
+{
+public:
+    explicit            DataLabelsConverter( const ConverterRoot& rParent, DataLabelsModel& rModel );
+    virtual             ~DataLabelsConverter() override;
+
+    /** Converts OOXML data label settings for the passed data series. */
+    void                convertFromModel(
+                            const css::uno::Reference< css::chart2::XDataSeries >& rxDataSeries,
+                            const TypeGroupConverter& rTypeGroup );
+};
+
+
+class ErrorBarConverter final : public ConverterBase< ErrorBarModel >
+{
+public:
+    explicit            ErrorBarConverter( const ConverterRoot& rParent, ErrorBarModel& rModel );
+    virtual             ~ErrorBarConverter() override;
+
+    /** Converts an OOXML errorbar and inserts it into the passed data series. */
+    void                convertFromModel(
+                            const css::uno::Reference< css::chart2::XDataSeries >& rxDataSeries );
+
+private:
+    css::uno::Reference< css::chart2::data::XLabeledDataSequence >
+                        createLabeledDataSequence( ErrorBarModel::SourceType eSourceType );
+};
+
+
+class TrendlineLabelConverter final : public ConverterBase< TrendlineLabelModel >
+{
+public:
+    explicit            TrendlineLabelConverter( const ConverterRoot& rParent, TrendlineLabelModel& rModel );
+    virtual             ~TrendlineLabelConverter() override;
+
+    /** Converts the OOXML trendline label. */
+    void                convertFromModel( PropertySet& rPropSet );
+};
+
+
+class TrendlineConverter final : public ConverterBase< TrendlineModel >
+{
+public:
+    explicit            TrendlineConverter( const ConverterRoot& rParent, TrendlineModel& rModel );
+    virtual             ~TrendlineConverter() override;
+
+    /** Converts an OOXML trendline and inserts it into the passed data series. */
+    void                convertFromModel(
+                            const css::uno::Reference< css::chart2::XDataSeries >& rxDataSeries );
+};
+
+
+class DataPointConverter final : public ConverterBase< DataPointModel >
+{
+public:
+    explicit            DataPointConverter( const ConverterRoot& rParent, DataPointModel& rModel );
+    virtual             ~DataPointConverter() override;
+
+    /** Converts settings for a data point in the passed series. */
+    void                convertFromModel(
+                            const css::uno::Reference< css::chart2::XDataSeries >& rxDataSeries,
+                            const TypeGroupConverter& rTypeGroup,
+                            const SeriesModel& rSeries );
+};
+
+
+class SeriesConverter final : public ConverterBase< SeriesModel >
+{
+public:
+    explicit            SeriesConverter( const ConverterRoot& rParent, SeriesModel& rModel );
+    virtual             ~SeriesConverter() override;
+
+    /** Creates a labeled data sequence object from category data link. */
+    css::uno::Reference< css::chart2::data::XLabeledDataSequence >
+                        createCategorySequence( const OUString& rRole );
+    /** Creates a labeled data sequence object from value data link. */
+    css::uno::Reference< css::chart2::data::XLabeledDataSequence >
+                        createValueSequence( const OUString& rRole );
+    /** Creates a data series object with initialized source links. */
+    css::uno::Reference< css::chart2::XDataSeries >
+                        createDataSeries( const TypeGroupConverter& rTypeGroup, bool bVaryColorsByPoint );
+
+private:
+    css::uno::Reference< css::chart2::data::XLabeledDataSequence >
+                        createLabeledDataSequence(
+                            SeriesModel::SourceType eSourceType,
+                            const OUString& rRole,
+                            bool bUseTextLabel );
+};
+
+
+} // namespace chart
+} // namespace drawingml
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */