rem: return elem.tagName && elem.ownerDocument && !elem.ownerDocument.body; 
add: return elem.documentElement && !elem.body || elem.tagName && elem.ownerDocument && !elem.ownerDocument.body; 
context: 	isXMLDoc: function(elem) {		return elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;	},
meta: 2798	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2798/f8b00051c377360f0106e56c24df1353aaf6ad44/jquery.js/buggy/src/jquery/jquery.js