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diff --git a/offapi/com/sun/star/chart2/XTransformation.idl b/offapi/com/sun/star/chart2/XTransformation.idl
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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 com_sun_star_chart2_XTransformation_idl
+#define com_sun_star_chart2_XTransformation_idl
+
+#include <com/sun/star/uno/XInterface.idl>
+#include <com/sun/star/lang/IllegalArgumentException.idl>
+
+module com
+{
+module sun
+{
+module star
+{
+module chart2
+{
+
+    // NOTES
+
+    //... provide help for creating the right transformation
+    // ... access to source and destination coordinate system ?
+
+/** allows the transformation of numeric values from one
+    coordinate-system into another.  Values may be transformed using
+    any mapping.
+ */
+interface XTransformation : ::com::sun::star::uno::XInterface
+{
+    /** transforms the given input data tuple, given in the source
+        coordinate system, according to the internal transformation
+        rules, into a tuple of transformed coordinates in the
+        destination coordinate system.
+
+        <p>Note that both coordinate systems may have different
+        dimensions, e.g., if a transformation does simply a projection
+        into a lower-dimensional space.</p>
+
+        @param aValues a source tuple of data that is to be
+               transformed.  The length of this sequence must be
+               equivalent to the dimension of the source coordinate
+               system.
+
+        @return the transformed data tuple.  The length of this
+                sequence is equal to the dimension of the output
+                coordinate system.
+
+        @throws ::com::sun::star::lang::IllegalArgumentException
+               if the dimension of the input vector is not equal to the
+               dimension given in getSourceDimension().
+     */
+    sequence< double > transform( [in] sequence< double > aValues )
+        raises( ::com::sun::star::lang::IllegalArgumentException );
+
+    /** the dimension of the input coordinate sequence that is to be
+        transformed by the transform() method.
+     */
+    long getSourceDimension();
+
+    /** the dimension of the output coordinate sequence that is the
+        result of the transform() method.
+     */
+    long getTargetDimension();
+};
+
+} ; // chart2
+} ; // com
+} ; // sun
+} ; // star
+
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */