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diff --git a/chart2/source/model/template/DataInterpreter.cxx b/chart2/source/model/template/DataInterpreter.cxx
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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 .
+ */
+
+#include <DataInterpreter.hxx>
+#include <DataSeries.hxx>
+#include <DataSource.hxx>
+#include <DataSeriesHelper.hxx>
+#include <CommonConverters.hxx>
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <tools/diagnose_ex.h>
+
+#include <algorithm>
+#include <cstddef>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::chart2;
+using namespace ::std;
+
+using ::com::sun::star::uno::Reference;
+using ::com::sun::star::uno::Sequence;
+
+#ifdef DEBUG_CHART2_TEMPLATE
+namespace
+{
+void lcl_ShowDataSource( const Reference< data::XDataSource > & xSource );
+}
+#endif
+
+namespace chart
+{
+
+DataInterpreter::DataInterpreter()
+{}
+
+DataInterpreter::~DataInterpreter()
+{}
+
+// ____ XDataInterpreter ____
+InterpretedData DataInterpreter::interpretDataSource(
+    const Reference< data::XDataSource >& xSource,
+    const Sequence< beans::PropertyValue >& aArguments,
+    const std::vector< rtl::Reference< DataSeries > >& aSeriesToReUse )
+{
+    if( ! xSource.is())
+        return InterpretedData();
+
+#ifdef DEBUG_CHART2_TEMPLATE
+    lcl_ShowDataSource( xSource );
+#endif
+
+    std::vector< uno::Reference< chart2::data::XLabeledDataSequence > > aData = getDataSequences(xSource);
+
+    uno::Reference< chart2::data::XLabeledDataSequence > xCategories;
+    vector< uno::Reference< chart2::data::XLabeledDataSequence > > aSequencesVec;
+
+    // check if we should use categories
+
+    bool bHasCategories( HasCategories( aArguments, aData ));
+
+    // parse data
+    bool bCategoriesUsed = false;
+    for( uno::Reference< chart2::data::XLabeledDataSequence > const & labeledData : aData )
+    {
+        try
+        {
+            if( bHasCategories && ! bCategoriesUsed )
+            {
+                xCategories = labeledData;
+                if( xCategories.is())
+                    SetRole( xCategories->getValues(), "categories");
+                bCategoriesUsed = true;
+            }
+            else
+            {
+                aSequencesVec.push_back( labeledData );
+                if( labeledData.is())
+                    SetRole( labeledData->getValues(), "values-y");
+            }
+        }
+        catch( const uno::Exception & )
+        {
+            DBG_UNHANDLED_EXCEPTION("chart2");
+        }
+    }
+
+    // create DataSeries
+    std::size_t nSeriesIndex = 0;
+    vector< rtl::Reference< DataSeries > > aSeriesVec;
+    aSeriesVec.reserve( aSequencesVec.size());
+
+    for (auto const& elem : aSequencesVec)
+    {
+        std::vector< uno::Reference< chart2::data::XLabeledDataSequence > > aNewData { elem };
+        rtl::Reference< DataSeries > xSeries;
+        if( nSeriesIndex < aSeriesToReUse.size())
+            xSeries = aSeriesToReUse[nSeriesIndex];
+        else
+            xSeries = new DataSeries;
+        assert( xSeries.is() );
+        xSeries->setData( aNewData );
+
+        aSeriesVec.push_back( xSeries );
+        ++nSeriesIndex;
+    }
+
+    return { { aSeriesVec }, xCategories };
+}
+
+InterpretedData DataInterpreter::reinterpretDataSeries(
+    const InterpretedData& aInterpretedData )
+{
+    InterpretedData aResult( aInterpretedData );
+
+    sal_Int32 i=0;
+    std::vector< rtl::Reference< DataSeries > > aSeries( FlattenSequence( aInterpretedData.Series ));
+    const sal_Int32 nCount = aSeries.size();
+    for( ; i<nCount; ++i )
+    {
+        try
+        {
+            std::vector< uno::Reference< data::XLabeledDataSequence > > aNewSequences;
+
+            // values-y
+            uno::Reference< data::XLabeledDataSequence > xValuesY =
+                DataSeriesHelper::getDataSequenceByRole( aSeries[i], "values-y" );
+            // re-use values-... as values-y
+            if( ! xValuesY.is())
+            {
+                xValuesY =
+                    DataSeriesHelper::getDataSequenceByRole( aSeries[i], "values", true );
+                if( xValuesY.is())
+                    SetRole( xValuesY->getValues(), "values-y");
+            }
+            if( xValuesY.is())
+            {
+                aNewSequences = { xValuesY };
+            }
+
+            const std::vector< uno::Reference< data::XLabeledDataSequence > > & aSeqs = aSeries[i]->getDataSequences2();
+            if( aSeqs.size() != aNewSequences.size() )
+            {
+#ifdef DEBUG_CHART2_TEMPLATE
+                sal_Int32 j=0;
+                for( ; j<aSeqs.(); ++j )
+                {
+                    assert( aSeqs[j] == xValuesY && "All sequences should be used" );
+                }
+#endif
+                aSeries[i]->setData( aNewSequences );
+            }
+        }
+        catch( const uno::Exception & )
+        {
+            DBG_UNHANDLED_EXCEPTION("chart2");
+        }
+    }
+
+    return aResult;
+}
+
+// criterion: all series must have exactly one data::XLabeledDataSequence
+bool DataInterpreter::isDataCompatible(
+    const InterpretedData& aInterpretedData )
+{
+    const std::vector< rtl::Reference< DataSeries > > aSeries( FlattenSequence( aInterpretedData.Series ));
+    for( rtl::Reference< DataSeries > const & i : aSeries )
+    {
+        try
+        {
+            if( i->getDataSequences2().size() != 1 )
+                return false;
+        }
+        catch( const uno::Exception & )
+        {
+            DBG_UNHANDLED_EXCEPTION("chart2");
+        }
+    }
+
+    return true;
+}
+
+namespace
+{
+
+struct lcl_LabeledSequenceEquals
+{
+    explicit lcl_LabeledSequenceEquals( const Reference< data::XLabeledDataSequence > & xLSeqToCmp ) :
+            m_bHasLabels ( false ),
+            m_bHasValues ( false )
+    {
+        if( !xLSeqToCmp.is())
+            return;
+
+        Reference< data::XDataSequence > xSeq( xLSeqToCmp->getValues());
+        if( xSeq.is())
+        {
+            m_bHasValues = true;
+            m_aValuesRangeRep = xSeq->getSourceRangeRepresentation();
+        }
+
+        xSeq.set( xLSeqToCmp->getLabel());
+        if( xSeq.is())
+        {
+            m_bHasLabels = true;
+            m_aLabelRangeRep = xSeq->getSourceRangeRepresentation();
+        }
+    }
+
+    bool operator() ( const Reference< data::XLabeledDataSequence > & xSeq )
+    {
+        if( ! xSeq.is())
+            return false;
+
+        Reference< data::XDataSequence > xSeqValues( xSeq->getValues() );
+        Reference< data::XDataSequence > xSeqLabels( xSeq->getLabel() );
+        bool bHasValues = xSeqValues.is();
+        bool bHasLabels = xSeqLabels.is();
+
+        return ( ( (m_bHasValues == bHasValues) &&
+                   (!bHasValues || m_aValuesRangeRep == xSeqValues->getSourceRangeRepresentation()) ) &&
+                 ( (m_bHasLabels == bHasLabels) &&
+                   (!bHasLabels || m_aLabelRangeRep == xSeqLabels->getSourceRangeRepresentation()) )
+            );
+    }
+
+private:
+    bool m_bHasLabels;
+    bool m_bHasValues;
+    OUString m_aValuesRangeRep;
+    OUString m_aLabelRangeRep;
+};
+
+} // anonymous namespace
+
+rtl::Reference< DataSource > DataInterpreter::mergeInterpretedData(
+    const InterpretedData& aInterpretedData )
+{
+    vector< Reference< data::XLabeledDataSequence > > aResultVec;
+    aResultVec.reserve( aInterpretedData.Series.size() +
+                        1 // categories
+        );
+
+    if( aInterpretedData.Categories.is())
+        aResultVec.push_back( aInterpretedData.Categories );
+
+    const std::vector< rtl::Reference< DataSeries > > aSeries = FlattenSequence( aInterpretedData.Series );
+    for( rtl::Reference< DataSeries > const & dataSeries : aSeries )
+    {
+        try
+        {
+            // add all sequences of data series
+            for( uno::Reference< data::XLabeledDataSequence > const & xAdd : dataSeries->getDataSequences2() )
+            {
+                // only add if sequence is not yet in the result
+                if( none_of( aResultVec.begin(), aResultVec.end(),
+                             lcl_LabeledSequenceEquals( xAdd )) )
+                {
+                    aResultVec.push_back( xAdd );
+                }
+            }
+        }
+        catch( const uno::Exception & )
+        {
+            DBG_UNHANDLED_EXCEPTION("chart2");
+        }
+    }
+
+    return new DataSource(aResultVec);
+}
+
+uno::Any DataInterpreter::getChartTypeSpecificData(
+    const OUString & )
+{
+    return uno::Any();
+}
+
+// convenience methods
+
+OUString DataInterpreter::GetRole( const Reference< data::XDataSequence > & xSeq )
+{
+    OUString aResult;
+    if( ! xSeq.is())
+        return aResult;
+
+    try
+    {
+        Reference< beans::XPropertySet > xProp( xSeq, uno::UNO_QUERY_THROW );
+        xProp->getPropertyValue( "Role") >>= aResult;
+    }
+    catch( const uno::Exception & )
+    {
+        DBG_UNHANDLED_EXCEPTION("chart2");
+    }
+    return aResult;
+}
+
+void DataInterpreter::SetRole( const Reference< data::XDataSequence > & xSeq, const OUString & rRole )
+{
+    if( ! xSeq.is())
+        return;
+    try
+    {
+        Reference< beans::XPropertySet > xProp( xSeq, uno::UNO_QUERY_THROW );
+        xProp->setPropertyValue( "Role", uno::Any( rRole ));
+    }
+    catch( const uno::Exception & )
+    {
+        DBG_UNHANDLED_EXCEPTION("chart2");
+    }
+}
+
+uno::Any DataInterpreter::GetProperty(
+    const Sequence< beans::PropertyValue > & aArguments,
+    std::u16string_view rName )
+{
+    for( sal_Int32 i=aArguments.getLength(); i--; )
+    {
+        if( aArguments[i].Name == rName )
+            return aArguments[i].Value;
+    }
+    return uno::Any();
+}
+
+bool DataInterpreter::HasCategories(
+    const Sequence< beans::PropertyValue > & rArguments,
+    const std::vector< uno::Reference< chart2::data::XLabeledDataSequence > > & rData )
+{
+    bool bHasCategories = false;
+
+    if( rArguments.hasElements() )
+        GetProperty( rArguments, u"HasCategories" ) >>= bHasCategories;
+
+    for( std::size_t nLSeqIdx=0; ! bHasCategories && nLSeqIdx<rData.size(); ++nLSeqIdx )
+        bHasCategories = ( rData[nLSeqIdx].is() && GetRole( rData[nLSeqIdx]->getValues() ) == "categories");
+
+    return bHasCategories;
+}
+
+bool DataInterpreter::UseCategoriesAsX( const Sequence< beans::PropertyValue > & rArguments )
+{
+    bool bUseCategoriesAsX = true;
+    if( rArguments.hasElements() )
+        GetProperty( rArguments, u"UseCategoriesAsX" ) >>= bUseCategoriesAsX;
+    return bUseCategoriesAsX;
+}
+
+OUString SAL_CALL DataInterpreter::getImplementationName()
+{
+    return "com.sun.star.comp.chart2.DataInterpreter";
+}
+
+sal_Bool SAL_CALL DataInterpreter::supportsService( const OUString& rServiceName )
+{
+    return cppu::supportsService(this, rServiceName);
+}
+
+css::uno::Sequence< OUString > SAL_CALL DataInterpreter::getSupportedServiceNames()
+{
+    return { "com.sun.star.chart2.DataInterpreter" };
+}
+
+std::vector< uno::Reference< chart2::data::XLabeledDataSequence > > DataInterpreter::getDataSequences(
+        const css::uno::Reference< css::chart2::data::XDataSource >& xSource)
+{
+    std::vector< uno::Reference< chart2::data::XLabeledDataSequence > > aData;
+    for (const Reference< data::XLabeledDataSequence > & rLDS : xSource->getDataSequences() )
+    {
+        aData.push_back(rLDS);
+    }
+    return aData;
+}
+
+} // namespace chart
+
+#ifdef DEBUG_CHART2_TEMPLATE
+namespace
+{
+
+void lcl_ShowDataSource( const Reference< data::XDataSource > & xSource )
+{
+    if( ! xSource.is())
+        return;
+
+    SAL_INFO("chart2", "DataSource in DataInterpreter:" );
+    Sequence< Reference< data::XLabeledDataSequence > > aSequences( xSource->getDataSequences());
+    Reference< beans::XPropertySet > xProp;
+    OUString aId;
+    const sal_Int32 nMax = aSequences.getLength();
+    for( sal_Int32 k = 0; k < nMax; ++k )
+    {
+        if( aSequences[k].is())
+        {
+            OUString aSourceRepr("<none>");
+            if( aSequences[k]->getValues().is())
+                aSourceRepr = aSequences[k]->getValues()->getSourceRangeRepresentation();
+            xProp.set( aSequences[k]->getValues(), uno::UNO_QUERY );
+            if( xProp.is() &&
+                ( xProp->getPropertyValue( "Role") >>= aId ))
+            {
+                SAL_INFO("chart2", "  <data sequence " << k << "> Role: " << aId << ", Source: "<< aSourceRepr);
+            }
+            else
+            {
+                SAL_INFO("chart2", "  <data sequence " << k << "> unknown Role, Source: " << aSourceRepr );
+            }
+
+            aSourceRepr = "<none>";
+            if( aSequences[k]->getLabel().is())
+                aSourceRepr = aSequences[k]->getLabel()->getSourceRangeRepresentation();
+            xProp.set( aSequences[k]->getLabel(), uno::UNO_QUERY );
+            if( xProp.is() &&
+                ( xProp->getPropertyValue( "Role") >>= aId ))
+            {
+                SAL_INFO("chart2", "  <data sequence label " << k << "> Role: " << aId
+                        << ", Source: " << aSourceRepr );
+            }
+            else
+            {
+                SAL_INFO("chart2", "  <data sequence label " << k << "> unknown Role, Source: " << aSourceRepr );
+            }
+        }
+    }
+}
+
+}
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */