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diff --git a/chart2/source/inc/UncachedDataSequence.hxx b/chart2/source/inc/UncachedDataSequence.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
+
+// helper classes
+#include <cppuhelper/compbase.hxx>
+#include <comphelper/uno3.hxx>
+#include <comphelper/broadcasthelper.hxx>
+#include <comphelper/propertycontainer.hxx>
+#include <comphelper/proparrhlp.hxx>
+#include <rtl/ref.hxx>
+
+// interfaces and types
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/chart2/data/XDataSequence.hpp>
+#include <com/sun/star/chart2/data/XNumericalDataSequence.hpp>
+#include <com/sun/star/chart2/data/XTextualDataSequence.hpp>
+#include <com/sun/star/container/XIndexReplace.hpp>
+#include <com/sun/star/container/XNamed.hpp>
+#include <com/sun/star/util/XCloneable.hpp>
+#include <com/sun/star/util/XModifiable.hpp>
+
+namespace com::sun::star::beans { class XPropertySetInfo; }
+namespace com::sun::star::chart2 { class XInternalDataProvider; }
+
+namespace chart
+{
+class InternalDataProvider;
+class ModifyEventForwarder;
+
+namespace impl
+{
+typedef ::cppu::WeakComponentImplHelper<
+    css::chart2::data::XDataSequence,
+    css::chart2::data::XNumericalDataSequence,
+    css::chart2::data::XTextualDataSequence,
+    css::util::XCloneable,
+    css::util::XModifiable, // contains util::XModifyBroadcaster
+    css::container::XIndexReplace,
+    css::container::XNamed, // for setting a new range representation
+    css::lang::XServiceInfo >
+    UncachedDataSequence_Base;
+}
+
+/**
+ * This sequence object does NOT store actual sequence data.  Instead, it
+ * references a column inside the internal data table (represented by class
+ * InternalData) via range representation string.  The range representation
+ * string ends with a numeric value that indicates the column index within
+ * the internal data table.
+ *
+ * <p>A range representation can be either '0', '1', '2', ..., or 'label 1',
+ * 'label 2', ...</p>
+ */
+class UncachedDataSequence final :
+        public ::comphelper::OMutexAndBroadcastHelper,
+        public ::comphelper::OPropertyContainer,
+        public ::comphelper::OPropertyArrayUsageHelper< UncachedDataSequence >,
+        public impl::UncachedDataSequence_Base
+{
+public:
+    /** The referring data provider is held as uno reference to ensure its
+        lifetime is at least as long as the one of this object.
+     */
+    UncachedDataSequence(
+        rtl::Reference< InternalDataProvider > xIntDataProv,
+        OUString aRangeRepresentation );
+    UncachedDataSequence(
+        rtl::Reference< InternalDataProvider > xIntDataProv,
+        OUString aRangeRepresentation,
+        const OUString & rRole );
+    UncachedDataSequence( const UncachedDataSequence & rSource );
+    virtual ~UncachedDataSequence() override;
+
+    /// declare XServiceInfo methods
+    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;
+
+    /// merge XInterface implementations
+    DECLARE_XINTERFACE()
+    /// merge XTypeProvider implementations
+    DECLARE_XTYPEPROVIDER()
+
+private:
+    // ____ XPropertySet ____
+    /// @see css::beans::XPropertySet
+    virtual css::uno::Reference< css::beans::XPropertySetInfo > SAL_CALL getPropertySetInfo() override;
+    /// @see ::comphelper::OPropertySetHelper
+    virtual ::cppu::IPropertyArrayHelper& SAL_CALL getInfoHelper() override;
+    /// @see ::comphelper::OPropertyArrayUsageHelper
+    virtual ::cppu::IPropertyArrayHelper* createArrayHelper() const override;
+
+    // ____ XDataSequence ____
+    virtual css::uno::Sequence< css::uno::Any > SAL_CALL getData() override;
+    virtual OUString SAL_CALL getSourceRangeRepresentation() override;
+    virtual css::uno::Sequence< OUString > SAL_CALL generateLabel(
+        css::chart2::data::LabelOrigin nLabelOrigin ) override;
+    virtual ::sal_Int32 SAL_CALL getNumberFormatKeyByIndex( ::sal_Int32 nIndex ) override;
+
+    // ____ XNumericalDataSequence ____
+    /// @see css::chart::data::XNumericalDataSequence
+    virtual css::uno::Sequence< double > SAL_CALL getNumericalData() override;
+
+    // ____ XTextualDataSequence ____
+    /// @see css::chart::data::XTextualDataSequence
+    virtual css::uno::Sequence< OUString > SAL_CALL getTextualData() override;
+
+    // ____ XIndexReplace ____
+    virtual void SAL_CALL replaceByIndex( ::sal_Int32 Index, const css::uno::Any& Element ) override;
+
+    // ____ XIndexAccess (base of XIndexReplace) ____
+    virtual ::sal_Int32 SAL_CALL getCount() override;
+    virtual css::uno::Any SAL_CALL getByIndex( ::sal_Int32 Index ) override;
+
+    // ____ XElementAccess (base of XIndexAccess) ____
+    virtual css::uno::Type SAL_CALL getElementType() override;
+    virtual sal_Bool SAL_CALL hasElements() override;
+
+    // ____ XNamed (for setting a new range representation) ____
+    virtual OUString SAL_CALL getName() override;
+    virtual void SAL_CALL setName( const OUString& aName ) override;
+
+    // ____ XCloneable ____
+    virtual css::uno::Reference< css::util::XCloneable > SAL_CALL createClone() override;
+
+    // ____ XModifiable ____
+    virtual sal_Bool SAL_CALL isModified() override;
+    virtual void SAL_CALL setModified( sal_Bool bModified ) override;
+
+    // ____ XModifyBroadcaster (base of XModifiable) ____
+    virtual void SAL_CALL addModifyListener(
+        const css::uno::Reference< css::util::XModifyListener >& aListener ) override;
+    virtual void SAL_CALL removeModifyListener(
+        const css::uno::Reference< css::util::XModifyListener >& aListener ) override;
+
+    void fireModifyEvent();
+
+    // <properties>
+    sal_Int32                                       m_nNumberFormatKey;
+    OUString                                 m_sRole;
+    OUString                                 m_aXMLRange;
+    // </properties>
+
+    /** This method registers all properties.  It should be called by all
+        constructors.
+     */
+    void registerProperties();
+
+    rtl::Reference< InternalDataProvider > m_xDataProvider;
+    OUString m_aSourceRepresentation;
+    rtl::Reference<ModifyEventForwarder> m_xModifyEventForwarder;
+};
+
+}  // namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */