diff --git a/code/GoogleSitemap.php b/code/GoogleSitemap.php
index 8217dfa..81b292d 100644
--- a/code/GoogleSitemap.php
+++ b/code/GoogleSitemap.php
@@ -37,7 +37,7 @@
  * 
  * @package googlesitemaps
  */
-class GoogleSitemap {
+class GoogleSitemap extends Object {
 
 	/**
 	 * List of {@link DataObject} class names to include. As well as the change
@@ -181,7 +181,7 @@ class GoogleSitemap {
 	 *
 	 * @return ArrayList
 	 */
-	public static function get_items($class, $page = 1) {
+	public function getItems($class, $page = 1) {
 		//normalise the class name
 		try {
 			$reflectionClass = new ReflectionClass($class);
@@ -203,7 +203,6 @@ class GoogleSitemap {
 
 		if($class == "SiteTree") {
 			$filter = ($filter) ? "\"ShowInSearch\" = 1" : "";
-
 			$instances = Versioned::get_by_stage('SiteTree', 'Live', $filter);
 		}
 		else if($class == "GoogleSitemapRoute") {
@@ -226,6 +225,8 @@ class GoogleSitemap {
 			$instances = new DataList($class);
 		}
 
+		$this->extend("alterDataList", $instances, $class);
+
 		$instances = $instances->limit(
 			$count, 
 			($page - 1) * $count
@@ -241,7 +242,21 @@ class GoogleSitemap {
 
 		return $output;
 	}
-	
+
+	/**
+	 * Static interface to instance level ->getItems() for backward compatibility.
+	 *
+	 * @param string
+	 * @param int
+	 *
+	 * @return ArrayList
+	 * @deprecated Please create an instance and call ->getSitemaps() instead.
+	 */
+	public static function get_items($class, $page = 1) {
+		return static::inst()->getItems($class, $page);
+	}
+
+
 	/**
 	 * Returns the string frequency of edits for a particular dataobject class.
 	 * 
@@ -258,6 +273,8 @@ class GoogleSitemap {
 				return $config['frequency'];
 			}
 		}
+
+		return '';
 	}
 
 	/**
@@ -284,7 +301,7 @@ class GoogleSitemap {
 	 *
 	 * @return ArrayList
 	 */
-	public static function get_sitemaps() {
+	public function getSitemaps() {
 		$countPerFile = Config::inst()->get('GoogleSitemap', 'objects_per_sitemap');
 		$sitemaps = new ArrayList();
 		$filter = Config::inst()->get('GoogleSitemap', 'use_show_in_search');
@@ -297,7 +314,9 @@ class GoogleSitemap {
 			}
 
 			$filter = ($filter) ? "\"ShowInSearch\" = 1" : "";
-			$instances = Versioned::get_by_stage('SiteTree', 'Live', $filter);
+			$class = 'SiteTree';
+			$instances = Versioned::get_by_stage($class, 'Live', $filter);
+			$this->extend("alterDataList", $instances, $class);
 			$count = $instances->count();
 
 			$neededForPage = ceil($count / $countPerFile);
@@ -323,7 +342,7 @@ class GoogleSitemap {
 			foreach(self::$dataobjects as $class => $config) {
 				$list = new DataList($class);
 				$list = $list->sort('LastEdited ASC');
-				
+				$this->extend("alterDataList", $list, $class);
 				$neededForClass = ceil($list->count() / $countPerFile);
 
 				for($i = 1; $i <= $neededForClass; $i++) {
@@ -357,6 +376,16 @@ class GoogleSitemap {
 		return $sitemaps;
 	}
 
+	/**
+	 * Static interface to instance level ->getSitemaps() for backward compatibility.
+	 *
+	 * @return ArrayList
+	 * @deprecated Please create an instance and call ->getSitemaps() instead.
+	 */
+	public static function get_sitemaps() {
+		return static::inst()->getSitemaps();
+	}
+
 	/**
 	 * Notifies Google about changes to your sitemap. This behavior is disabled 
 	 * by default, to enable, read the documentation provided in the docs folder.
@@ -420,5 +449,16 @@ class GoogleSitemap {
 	 */
 	public static function enabled() {
 		return (Config::inst()->get('GoogleSitemap', 'enabled', Config::INHERITED));
-	}  
+	}
+
+
+	/**
+	 * Convenience method for manufacturing an instance for hew instance-level methods (and for easier type definition).
+	 *
+	 * @return GoogleSitemap
+	 */
+	public static function inst() {
+		return GoogleSitemap::create();
+	}
+
 }
diff --git a/code/controllers/GoogleSitemapController.php b/code/controllers/GoogleSitemapController.php
index b6168df..44e3879 100644
--- a/code/controllers/GoogleSitemapController.php
+++ b/code/controllers/GoogleSitemapController.php
@@ -22,6 +22,7 @@ class GoogleSitemapController extends Controller {
 		'sitemap'	
 	);
 
+
 	/**
 	 * Default controller action for the sitemap.xml file. Renders a index
 	 * file containing a list of links to sub sitemaps containing the data.
@@ -35,7 +36,7 @@ class GoogleSitemapController extends Controller {
 			$this->getResponse()->addHeader('Content-Type', 'application/xml; charset="utf-8"');
 			$this->getResponse()->addHeader('X-Robots-Tag', 'noindex');
 
-			$sitemaps = GoogleSitemap::get_sitemaps();
+			$sitemaps = GoogleSitemap::inst()->getSitemaps();
 			$this->extend('updateGoogleSitemaps', $sitemaps);
 
 			return array(
@@ -62,7 +63,7 @@ class GoogleSitemapController extends Controller {
 			$this->getResponse()->addHeader('Content-Type', 'application/xml; charset="utf-8"');
 			$this->getResponse()->addHeader('X-Robots-Tag', 'noindex');
 
-			$items = GoogleSitemap::get_items($class, $page);
+			$items = GoogleSitemap::inst()->getItems($class, $page);
 			$this->extend('updateGoogleSitemapItems', $items, $class, $page);
 
 			return array(
diff --git a/tests/GoogleSitemapTest.php b/tests/GoogleSitemapTest.php
index 808c7e9..ff04be1 100644
--- a/tests/GoogleSitemapTest.php
+++ b/tests/GoogleSitemapTest.php
@@ -1,6 +1,8 @@
 <?php
 
 /**
+ * TODO: Migrate to new instance level interface instead of using static methods for retrieval of site maps and items (i.e. ->getSitemaps() instead of ::get_sitemaps()).
+ *
  * @package googlesitemaps
  * @subpackage tests
  */