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diff --git a/package/source/xstor/ohierarchyholder.hxx b/package/source/xstor/ohierarchyholder.hxx
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+++ b/package/source/xstor/ohierarchyholder.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_PACKAGE_SOURCE_XSTOR_OHIERARCHYHOLDER_HXX
+#define INCLUDED_PACKAGE_SOURCE_XSTOR_OHIERARCHYHOLDER_HXX
+
+#include <com/sun/star/embed/XStorage.hpp>
+#include <com/sun/star/embed/XTransactionListener.hpp>
+#include <com/sun/star/embed/XExtendedStorageStream.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/weakref.hxx>
+
+#include <comphelper/sequenceashashmap.hxx>
+
+#include <rtl/ref.hxx>
+
+#include <unordered_map>
+#include <vector>
+
+class OHierarchyElement_Impl;
+
+typedef std::unordered_map< OUString,
+                         ::rtl::Reference< OHierarchyElement_Impl > > OHierarchyElementList_Impl;
+
+typedef ::std::vector< css::uno::WeakReference< css::embed::XExtendedStorageStream > >
+                        OWeakStorRefVector_Impl;
+
+class OHierarchyElement_Impl : public cppu::WeakImplHelper< css::embed::XTransactionListener >
+{
+    ::osl::Mutex m_aMutex;
+
+    ::rtl::Reference< OHierarchyElement_Impl > m_rParent;
+    css::uno::Reference< css::embed::XStorage > m_xOwnStorage;
+    css::uno::WeakReference< css::embed::XStorage > m_xWeakOwnStorage;
+
+    OHierarchyElementList_Impl m_aChildren;
+
+    OWeakStorRefVector_Impl m_aOpenStreams;
+
+public:
+    explicit OHierarchyElement_Impl( const css::uno::Reference< css::embed::XStorage >& xStorage )
+    : m_xOwnStorage( xStorage )
+    {}
+
+    explicit OHierarchyElement_Impl( const css::uno::WeakReference< css::embed::XStorage >& xWeakStorage )
+    : m_xWeakOwnStorage( xWeakStorage )
+    {}
+
+    void Commit();
+
+    void SetParent( const ::rtl::Reference< OHierarchyElement_Impl >& rParent ) { m_rParent = rParent; }
+
+    void TestForClosing();
+
+    void RemoveElement( const ::rtl::Reference< OHierarchyElement_Impl >& aRef );
+
+    css::uno::Reference< css::embed::XExtendedStorageStream >
+        GetStreamHierarchically( sal_Int32 nStorageMode,
+                                std::vector<OUString>& aPath,
+                                sal_Int32 nStreamMode,
+                                const ::comphelper::SequenceAsHashMap& aEncryptionData );
+
+    void RemoveStreamHierarchically( std::vector<OUString>& aListPath );
+
+    // XEventListener
+    virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override;
+
+    // XTransactionListener
+    virtual void SAL_CALL preCommit( const css::lang::EventObject& aEvent ) override;
+    virtual void SAL_CALL commited( const css::lang::EventObject& aEvent ) override;
+    virtual void SAL_CALL preRevert( const css::lang::EventObject& aEvent ) override;
+    virtual void SAL_CALL reverted( const css::lang::EventObject& aEvent ) override;
+
+};
+
+class OHierarchyHolder_Impl : public ::cppu::OWeakObject
+{
+    css::uno::WeakReference< css::embed::XStorage > m_xWeakOwnStorage;
+    ::rtl::Reference< OHierarchyElement_Impl > m_xChild;
+public:
+    explicit OHierarchyHolder_Impl( const css::uno::Reference< css::embed::XStorage >& xOwnStorage )
+    : m_xWeakOwnStorage( xOwnStorage )
+    , m_xChild( new OHierarchyElement_Impl( css::uno::WeakReference< css::embed::XStorage >( xOwnStorage ) ) )
+    {}
+
+    static std::vector<OUString> GetListPathFromString( std::u16string_view aPath );
+
+    css::uno::Reference< css::embed::XExtendedStorageStream >
+        GetStreamHierarchically( sal_Int32 nStorageMode,
+                                std::vector<OUString>& aListPath,
+                                sal_Int32 nStreamMode,
+                                const ::comphelper::SequenceAsHashMap& aEncryptionData = ::comphelper::SequenceAsHashMap() );
+
+    void RemoveStreamHierarchically( std::vector<OUString>& aListPath );
+};
+
+#endif // _OHIERARCHYHOLDER
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */