From d6e541426d10b335fa3b6b481ae591ede977c480 Mon Sep 17 00:00:00 2001
From: John Resig <jeresig@gmail.com>
Date: Mon, 19 Jan 2009 18:56:02 +0000
Subject: [PATCH] Fixed the logic for determining if an XML file is being used.
 Fixes jQuery bug #3896.

---
 src/selector.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/selector.js b/src/selector.js
index 682a92ebe..9fffeabd7 100644
--- a/src/selector.js
+++ b/src/selector.js
@@ -809,8 +809,8 @@ var contains = document.compareDocumentPosition ?  function(a, b){
 };
 
 var isXML = function(elem){
-	return elem.documentElement && !elem.body ||
-		elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
+	return elem && elem.nodeType === 9 && elem.nodeName !== "HTML" ||
+		isXML( elem.ownerDocument );
 };
 
 var posProcess = function(selector, context){