add "limit" navigation control to xml query and db classes

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0-DB@8395 201d5d3c-b55e-5fd7-737f-ddc643e51545

classes/db/queryparts/limit/Limit.class.php

@@ -0,0 +1,16 @@
+<?php 
+	class Limit {
+		var $start;
+		var $end;
+		
+		function Limit($page, $list_count){
+			$this->start = ($page-1)*$list_count;
+			$this->end = $list_count;
+		}
+		
+		function toString(){
+			return $this->start . ' , ' . $this->end;
+		}
+	}
+
+?>