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diff --git a/ext/spl/examples/recursivecomparedualiterator.inc b/ext/spl/examples/recursivecomparedualiterator.inc
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+<?php
+
+/** @file recursivecomparedualiterator.inc
+ * @ingroup Examples
+ * @brief class DualIterator
+ * @author  Marcus Boerger
+ * @date    2003 - 2006
+ *
+ * SPL - Standard PHP Library
+ */
+
+/** @ingroup Examples
+ * @brief   Recursive comparison iterator for a RecursiveDualIterator
+ * @author  Marcus Boerger
+ * @version 1.0
+ */
+class RecursiveCompareDualIterator extends RecursiveIteratorIterator
+{
+	/** Used to keep end of recursion equality. That is en leaving a nesting
+	 * level we need to check whether both child iterators are at their end.
+	 */
+	protected $equal = false;
+
+	/** Construct from RecursiveDualIterator
+	 *
+	 * @param $it      RecursiveDualIterator
+	 * @param $mode    should be LEAVES_ONLY
+	 * @param $flags   should be 0
+	 */
+	function __construct(RecursiveDualIterator $it, $mode = self::LEAVES_ONLY, $flags = 0)
+	{
+		parent::__construct($it);
+	}
+
+	/** Rewind iteration andcomparison process. Starting with $equal = true.
+	 */	
+	function rewind()
+	{
+		$this->equal = true;
+		parent::rewind();
+	}
+
+	/** Calculate $equal
+	 * @see $equal
+	 */
+	function endChildren()
+	{
+		$this->equal &= !$this->getInnerIterator()->getLHS()->valid()
+		             && !$this->getInnerIterator()->getRHS()->valid();
+	}
+
+	/** @return whether both inner iterators are valid and have identical 
+	 * current and key values or both are non valid.
+	 */
+	function areIdentical()
+	{
+		return $this->equal && $this->getInnerIterator()->areIdentical();
+	}
+
+	/** @return whether both inner iterators are valid and have equal current 
+	 * and key values or both are non valid.
+	 */
+	function areEqual()
+	{
+		return $this->equal && $this->getInnerIterator()->areEqual();
+	}
+}
+
+?>