<?php	/* lvoge@cs.vu.nl */

	function nodelist($arg) {
		$res = array();
		$dom = new domDocument;
		$dom->load("nodes.xml");
		foreach ($dom->getElementsByTagName('node') as $node)
		  $res[] = '"' . $node->getAttribute('name') . '"';
		sort($res);
		return "new Array(" . join($res, ',') . ")";
	}

	function findnode($name) {
		$dom = new domDocument;
		$dom->load("nodes.xml");
		$found = 0;
		foreach ($dom->getElementsByTagName('node') as $node)
		  if ($node->getAttribute('name') == $name)
		    return array($dom, $node);
		return NULL;
	}

	function deletenode($arg) {
		$a = findnode($arg);
		if ($a != NULL) {
			$dom = $a[0];
			$node = $a[1];
			$node->parentNode->removeChild($node);
			$dom->save("nodes.xml");
		} else {
			// oops
		}
	}

	function getnode($arg) {
		$a = findnode($arg);
		if ($a != NULL) {
			$node = $a[1];
			$dom = new domDocument;
			$dom->appendChild($dom->importNode($node, true));
			$dom->save("/tmp/foo.xml");
			header("Content-type: text/xml");
			return $dom->saveXML();
		} else {
			return "not found";
			// oops
		}
	}

	$handlers = array(
		'nodelist' => nodelist,
		'delete' => deletenode,
		'get' => getnode,
	);
	foreach ($handlers as $k => $v)
	  if (array_key_exists($k, $_REQUEST)) {
	  	print $v($_REQUEST[$k]);
		break;
	  }
?>