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diff --git a/include/linguistic/spelldta.hxx b/include/linguistic/spelldta.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_LINGUISTIC_SPELLDTA_HXX
+#define INCLUDED_LINGUISTIC_SPELLDTA_HXX
+
+#include <vector>
+#include <com/sun/star/linguistic2/XSpellAlternatives.hpp>
+#include <com/sun/star/linguistic2/XSetSpellAlternatives.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <linguistic/lngdllapi.h>
+#include <i18nlangtag/lang.h>
+#include <config_options.h>
+
+namespace com::sun::star::linguistic2 { class XSearchableDictionaryList; }
+
+
+namespace linguistic
+{
+
+std::vector< OUString >
+        MergeProposalSeqs(
+                std::vector< OUString > &rAlt1,
+                std::vector< OUString > &rAlt2 );
+
+void    SeqRemoveNegEntries(
+                std::vector< OUString > &rSeq,
+                css::uno::Reference< css::linguistic2::XSearchableDictionaryList > const &rxDicList,
+                LanguageType nLanguage );
+
+void SearchSimilarText( const OUString &rText, LanguageType nLanguage,
+        css::uno::Reference< css::linguistic2::XSearchableDictionaryList > const &xDicList,
+        std::vector< OUString > & rDicListProps );
+
+
+class SpellAlternatives final
+    : public cppu::WeakImplHelper
+    <
+        css::linguistic2::XSpellAlternatives,
+        css::linguistic2::XSetSpellAlternatives
+    >
+{
+    css::uno::Sequence< OUString >  aAlt;   // list of alternatives, may be empty.
+    OUString                        aWord;
+    sal_Int16                       nType;          // type of failure
+    LanguageType                    nLanguage;
+
+public:
+    UNLESS_MERGELIBS(LNG_DLLPUBLIC) SpellAlternatives();
+    SpellAlternatives(OUString aWord, LanguageType nLang,
+                      const css::uno::Sequence< OUString > &rAlternatives );
+    virtual ~SpellAlternatives() override;
+    SpellAlternatives(const SpellAlternatives&) = delete;
+    SpellAlternatives& operator=( const SpellAlternatives& ) = delete;
+
+    // XSpellAlternatives
+    virtual OUString SAL_CALL getWord(  ) override;
+    virtual css::lang::Locale SAL_CALL getLocale(  ) override;
+    virtual ::sal_Int16 SAL_CALL getFailureType(  ) override;
+    virtual ::sal_Int16 SAL_CALL getAlternativesCount(  ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getAlternatives(  ) override;
+
+    // XSetSpellAlternatives
+    virtual void SAL_CALL setAlternatives( const css::uno::Sequence< OUString >& aAlternatives ) override;
+    virtual void SAL_CALL setFailureType( ::sal_Int16 nFailureType ) override;
+
+    // non-interface specific functions
+    void    UNLESS_MERGELIBS(LNG_DLLPUBLIC) SetWordLanguage(const OUString &rWord, LanguageType nLang);
+    void    UNLESS_MERGELIBS(LNG_DLLPUBLIC) SetFailureType(sal_Int16 nTypeP);
+    void    UNLESS_MERGELIBS(LNG_DLLPUBLIC) SetAlternatives( const css::uno::Sequence< OUString > &rAlt );
+    static css::uno::Reference < css::linguistic2::XSpellAlternatives > UNLESS_MERGELIBS(LNG_DLLPUBLIC) CreateSpellAlternatives(
+        const OUString &rWord, LanguageType nLang, sal_Int16 nTypeP, const css::uno::Sequence< OUString > &rAlt );
+};
+
+}   // namespace linguistic
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */