Added return type switching.

* Uncommented the return type logic in the controller and implemented it (no sanity checking on if the return type is valid as per the module)

 * Cleaned up some @todo's in the Controller class

 * Added the XML Display class

classes/Display/XML.php

@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * XML Display Class File for PICKLES
+ *
+ * PHP version 5
+ *
+ * Licensed under the GNU General Public License Version 3
+ * Redistribution of these files must retain the above copyright notice.
+ *
+ * @package   PICKLES
+ * @author    Josh Sherman <josh@phpwithpickles.org>
+ * @copyright Copyright 2007-2010, Gravity Boulevard, LLC
+ * @license   http://www.gnu.org/licenses/gpl.html GPL v3
+ * @link      http://phpwithpickles.org
+ */
+
+/**
+ * XML Display
+ *
+ * Displays data in JavaScript Object Notation.
+ *
+ * Requires PHP 5 >= 5.2.0 or PECL json >= 1.2.0
+ * Note: PECL json 1.2.1 is included /vendors
+ *
+ * @link http://json.org/
+ * @link http://us.php.net/json_encode
+ * @link http://pecl.php.net/package/json
+ */
+class Display_XML extends Display_Common
+{
+	/**
+	 * Renders the data in XML format
+	 */
+	public function render()
+	{
+		echo $this->arrayToXML($this->module_return);
+	}
+
+	/**
+	 * Array to XML
+	 *
+	 * Converts an array into XML tags (recursive).
+	 *
+	 * @access private
+	 * @param  array $array array to convert into XML
+	 * @return string generated XML
+	 */
+	private function arrayToXML($array)
+	{
+		$xml = '';
+
+		if (is_array($array))
+		{
+			foreach ($array as $tag => $data)
+			{
+				if (is_int($tag))
+				{
+					$xml .= (is_array($data) ? $this->arrayToXML($data) : $data);
+				}
+				else
+				{
+					$xml .= '<' . $tag . '>' . (is_array($data) ? $this->array2Xml($data) : $data) . '</' . $tag . '>';
+				}
+			}
+		}
+
+		return $xml;
+	}
+}
+
+?>