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diff --git a/reportbuilder/java/com/sun/star/report/ReportFunction.java b/reportbuilder/java/com/sun/star/report/ReportFunction.java
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+/*************************************************************************
+ *
+ * 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.
+ *
+ ************************************************************************/
+package com.sun.star.report;
+
+/**
+ * Functions are statefull computation components.
+ *
+ * Functions are allowed to have a state, but are considered
+ * immutable (the same is true for expressions). Functions are
+ * allowed to update their state on every call to 'advance', which
+ * signals, that the cursor has been moved.
+ *
+ * Functions have no way to 'reset' their state, if a reset is needed,
+ * the report engine is urged to query a new instance from the ReportAddin.
+ */
+public interface ReportFunction extends ReportExpression
+{
+
+    public ReportFunction advance(DataRow row);
+}