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diff --git a/xmerge/source/xmerge/java/org/openoffice/xmerge/merger/diff/TextNodeIterator.java b/xmerge/source/xmerge/java/org/openoffice/xmerge/merger/diff/TextNodeIterator.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 org.openoffice.xmerge.merger.diff;
+
+import org.w3c.dom.Node;
+
+import org.openoffice.xmerge.converter.xml.OfficeConstants;
+
+
+/**
+ *  <p>This is an implementation of the <code>Iterator</code> interface.
+ *  It will traverse the tree and find text/space/tab <code>Node</code>
+ *  sequences.</p>
+ *
+ *  <p>Note: Once the XML Tree is parsed, then the <code>Iterator</code>
+ *  will be a snap shot of that tree. That means even the tree is modified
+ *  later, than the cached paragraph <code>Node</code> list will not be
+ *  updated accordingly.  For this reason  and for performance reasons
+ *  this <code>Iterator</code> does not support any operation methods
+ *  such as insert, remove or replace.  The main purpose of this
+ *  <code>Iterator</code> is to be used with difference, not with merge.</p>
+ *
+ *  @author smak
+ */
+public final class TextNodeIterator extends NodeIterator {
+
+    /**
+     *  Standard constructor.
+     *
+     *  @param  initial  The initial root <code>Node</code>.
+     */
+    public TextNodeIterator(Node node) {
+        super(null, node);
+    }
+
+    /**
+     *  Overwrite the parent <code>nodeSupported</code> method.  Only text
+     *  <code>Node</code> objects are supported.
+     *
+     *  @param  node  <code>Node</code> to check.
+     *
+     *  @return  true if the <code>Node</code> is supported, false
+     *           otherwise.
+     */
+    protected boolean nodeSupported(Node node) {
+
+        // can use an array later to check all possible tags for
+        // future expansion
+        if (node.getNodeType() == Node.TEXT_NODE ||
+            node.getNodeName().equals(OfficeConstants.TAG_SPACE) ||
+            node.getNodeName().equals(OfficeConstants.TAG_TAB_STOP) ||
+            node.getNodeName().equals(OfficeConstants.TAG_LINE_BREAK)) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}
+