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diff --git a/chart2/source/inc/DataInterpreter.hxx b/chart2/source/inc/DataInterpreter.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 "DataSeries.hxx"
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <com/sun/star/chart2/data/XDataSource.hpp>
+#include <rtl/ref.hxx>
+#include <vector>
+
+namespace chart
+{
+class DataSeries;
+class DataSource;
+class LabeledDataSequence;
+
+/** offers tooling to interpret different data sources in a structural
+     and chart-type-dependent way.
+  */
+struct InterpretedData
+{
+    std::vector< std::vector< rtl::Reference<::chart::DataSeries> > > Series;
+    css::uno::Reference< css::chart2::data::XLabeledDataSequence > Categories;
+};
+
+/** offers tooling to interpret different data sources in a structural
+    and chart-type-dependent way.
+ */
+class SAL_DLLPUBLIC_RTTI DataInterpreter : public ::cppu::WeakImplHelper<
+        css::lang::XServiceInfo >
+{
+public:
+    explicit DataInterpreter();
+    virtual ~DataInterpreter() override;
+
+    /// XServiceInfo declarations
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // convenience methods
+    static  OUString GetRole( const css::uno::Reference< css::chart2::data::XDataSequence > & xSeq );
+
+    static void SetRole(
+        const css::uno::Reference< css::chart2::data::XDataSequence > & xSeq,
+        const OUString & rRole );
+
+    static css::uno::Any GetProperty(
+        const css::uno::Sequence<css::beans::PropertyValue > & aArguments,
+        std::u16string_view rName );
+
+    static bool HasCategories(
+        const css::uno::Sequence< css::beans::PropertyValue > & rArguments,
+        const std::vector< css::uno::Reference< css::chart2::data::XLabeledDataSequence > > & rData );
+
+    static bool UseCategoriesAsX(
+        const css::uno::Sequence< css::beans::PropertyValue > & rArguments );
+
+    static std::vector<css::uno::Reference< css::chart2::data::XLabeledDataSequence >> getDataSequences(
+        const css::uno::Reference< css::chart2::data::XDataSource >& xSource);
+
+    // ____ DataInterpreter ____
+    /** Interprets the given data.
+
+        @param xSource
+            the data source.
+
+        @param aArguments
+            Arguments that tell the template how to slice the given
+            range.  The properties should be defined in a separate
+            service.
+
+            <p>For standard parameters that may be used, see the
+            service StandardDiagramCreationParameters.
+            </p>
+
+        @param aSeriesToReUse
+            use all the data series given here for the result before
+            creating new ones.
+     */
+    virtual InterpretedData interpretDataSource(
+        const css::uno::Reference< css::chart2::data::XDataSource >& xSource,
+        const css::uno::Sequence< css::beans::PropertyValue >& aArguments,
+        const std::vector< rtl::Reference< ::chart::DataSeries > >& aSeriesToReUse );
+
+    /** Re-interprets the data given in <code>aInterpretedData</code>
+        while keeping the number of data series and the categories.
+     */
+    virtual InterpretedData reinterpretDataSeries(
+        const InterpretedData& aInterpretedData );
+
+    /** parses the given data and states, if a
+        reinterpretDataSeries() call can be done
+        without data loss.
+
+        @return
+            `TRUE`, if the data given in
+            <code>aInterpretedData</code> has a similar structure than
+            the one required is used as output of the data interpreter.
+     */
+    virtual bool isDataCompatible(
+        const InterpretedData& aInterpretedData );
+
+    /** Try to reverse the operation done in
+        interpretDataSource().
+
+        <p>In case <code>aInterpretedData</code> is the result of
+        interpretDataSource()( <code>xSource</code> ),
+        the result of this method should be <code>xSource</code>.</p>
+     */
+    static rtl::Reference< ::chart::DataSource > mergeInterpretedData(
+        const InterpretedData& aInterpretedData );
+
+    /** Get chart information that is specific to a particular chart
+        type, by key.
+
+        @param sKey
+            name of the piece of data to retrieve.
+
+        <p>Supported key strings:</p>
+        <ul>
+            <li><tt>"stock variant"</tt>: stock chart variant,
+            with 0 = neither Open Values nor volume, 1 = Open Values,
+            2 = volume, 3 = both. Valid for candlestick charts.</li>
+        </ul>
+
+        @return
+            The value requested, or nothing if not present.
+    */
+    virtual css::uno::Any getChartTypeSpecificData(
+        const OUString& sKey );
+};
+
+} // namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */