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diff --git a/oox/inc/oox/xls/sharedformulabuffer.hxx b/oox/inc/oox/xls/sharedformulabuffer.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef OOX_XLS_SHAREDFORMULABUFFER_HXX
+#define OOX_XLS_SHAREDFORMULABUFFER_HXX
+
+#include <map>
+#include <memory>
+#include "oox/xls/worksheethelper.hxx"
+
+namespace com { namespace sun { namespace star {
+    namespace sheet { class XFormulaTokens; }
+    namespace sheet { class XNamedRange; }
+} } }
+
+namespace oox {
+namespace xls {
+
+// ============================================================================
+
+/** Formula context that supports shared formulas. */
+class ExtCellFormulaContext : public SimpleFormulaContext, public WorksheetHelper
+{
+public:
+    explicit            ExtCellFormulaContext(
+                            const WorksheetHelper& rHelper,
+                            const ::com::sun::star::uno::Reference< ::com::sun::star::sheet::XFormulaTokens >& rxTokens,
+                            const ::com::sun::star::table::CellAddress& rCellPos );
+
+    virtual void        setSharedFormula( const ::com::sun::star::table::CellAddress& rBaseAddr );
+};
+
+// ============================================================================
+
+class SharedFormulaBuffer : public WorksheetHelper
+{
+public:
+    explicit            SharedFormulaBuffer( const WorksheetHelper& rHelper );
+
+    /** Imports a shared formula from a OOX formula string. */
+    void                importSharedFmla( const ::rtl::OUString& rFormula,
+                            const ::rtl::OUString& rSharedRange, sal_Int32 nId,
+                            const ::com::sun::star::table::CellAddress& rBaseAddr );
+    /** Imports a shared formula from a SHAREDFORMULA record in the passed stream */
+    void                importSharedFmla( RecordInputStream& rStrm,
+                            const ::com::sun::star::table::CellAddress& rBaseAddr );
+    /** Imports a shared formula from a SHAREDFMLA record in the passed stream. */
+    void                importSharedFmla( BiffInputStream& rStrm,
+                            const ::com::sun::star::table::CellAddress& rBaseAddr );
+
+    /** Inserts a shared formula with the passed base address into a cell
+        described by the passed formula context. */
+    void                setSharedFormulaCell(
+                            ExtCellFormulaContext& rContext,
+                            const ::com::sun::star::table::CellAddress& rBaseAddr );
+    /** Inserts a shared formula with the passed base address into a cell
+        described by the passed formula context. */
+    void                setSharedFormulaCell(
+                            ExtCellFormulaContext& rContext,
+                            sal_Int32 nSharedId );
+
+private:
+    ::com::sun::star::uno::Reference< ::com::sun::star::sheet::XNamedRange >
+                        createDefinedName( const BinAddress& rMapKey );
+
+    bool                implSetSharedFormulaCell(
+                            ExtCellFormulaContext& rContext,
+                            const BinAddress& rMapKey );
+
+    void                updateCachedCell(
+                            const ::com::sun::star::table::CellAddress& rBaseAddr,
+                            const BinAddress& rMapKey );
+
+private:
+    typedef ::std::map< BinAddress, sal_Int32 >         TokenIndexMap;
+    typedef ::std::auto_ptr< ExtCellFormulaContext >    ContextPtr;
+
+    TokenIndexMap       maIndexMap;         /// Maps shared formula base address to defined name identifier.
+    ContextPtr          mxLastContext;      /// Cached formula context for leading formula cell.
+};
+
+// ============================================================================
+
+} // namespace xls
+} // namespace oox
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */