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diff --git a/offapi/com/sun/star/configuration/backend/XUpdatableLayer.idl b/offapi/com/sun/star/configuration/backend/XUpdatableLayer.idl
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+++ b/offapi/com/sun/star/configuration/backend/XUpdatableLayer.idl
@@ -0,0 +1,71 @@
+/* -*- 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 __com_sun_star_configuration_backend_XUpdatableLayer_idl__
+#define __com_sun_star_configuration_backend_XUpdatableLayer_idl__
+
+#include <com/sun/star/configuration/backend/XLayer.idl>
+#include <com/sun/star/lang/NullPointerException.idl>
+#include <com/sun/star/lang/WrappedTargetException.idl>
+#include <com/sun/star/configuration/backend/MalformedDataException.idl>
+
+
+module com { module sun { module star { module configuration { module backend {
+
+
+/**
+  Provides access to a read-write layer of configuration data for
+  a given component and entity.
+
+    @since OOo 1.1.2
+  */
+published interface XUpdatableLayer : XLayer
+{
+
+    /**
+       Replaces the current layer with the layer given as input
+       parameter.
+
+       <p> After the replacement has been performed, reading the
+           layer will return the new content. Some implementations
+           may not support this, so after an update
+           XLayer::readData() may fail.
+        </p>
+
+       @param aNewLayer
+               replacement layer
+
+       @throws com::sun::star::lang::NullPointerException
+               if a `NULL` handler is passed.
+       @throws com::sun::star::lang::WrappedTargetException
+               if an error occurs during the replacement.
+       @throws com::sun::star::configuration::backend::MalformedDataException
+               if the layer contains invalid data.
+     */
+    void replaceWith([in] XLayer aNewLayer)
+        raises (com::sun::star::lang::NullPointerException,
+                com::sun::star::lang::WrappedTargetException,
+                MalformedDataException) ;
+
+} ;
+
+} ; } ; } ; } ; } ;
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */