MINOR Partially merged r66168 from branches/2.3 - the last merge was ignoring SiteTreeDecorator.php file which was necessary for the new googlesitemaps module compatiblity

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@75380 467b73ca-7a2a-4603-9d3b-597d59a354a9

core/model/SiteTreeDecorator.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Plug-ins for additional functionality in your SiteTree classes.
+ * 
+ * @package sapphire
+ * @subpackage model
+ */
+abstract class SiteTreeDecorator extends DataObjectDecorator {
+
+	function onBeforePublish(&$original) {
+	}
+
+	function onAfterPublish(&$original) {
+	}
+	
+	function onBeforeUnpublish() {
+	}
+	
+	function onAfterUnpublish() {
+	}
+	
+	function canAddChildren($member) {
+	}
+	
+	function canPublish($member) {
+		
+	}
+
+}
+
+?>