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<?phpclass node{	public $namespace;	public $tag;	public $content;	public $child;	public $sibling;		public function __construct($namespace, $tag, $content = null)	{		$this->namespace = $namespace;		$this->tag = $tag;		$this->content = $content;	}		public function add(node $node)	{		if($this->child)		{			for($c = $this->child; $c->sibling; $c = $c->sibling);			$c->sibling = $node;		}		else		{			$this->child = $node;		}	}		public function __toString()	{		$result = '';		$stack = array();		$cur = $this;				while(1)		{			if($cur)			{				if($cur->child !== null || $cur->content !== null)				{					$result .= sprintf("<%s:%s>", $cur->namespace, $cur->tag, $cur->content);										if($cur->content !== null)					{						$result .= sprintf("%s", $cur->content);					}										array_push($stack, $cur);					$cur = $cur->child;				}				else				{					$result .= sprintf("<%s:%s />", $cur->namespace, $cur->tag);					$cur = $cur->sibling;				}			}			elseif($stack)			{				$cur = array_pop($stack);				$result .= sprintf("</%s:%s>", $cur->namespace, $cur->tag);				$cur = $cur->sibling;			}			else			{				break;			}		}				return $result;	}}?>